docs: expand dartdocs and add compliance hooks

.githooks/pre-commit

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
+# Blocks commits that do not meet the repository's formatting, analyzer,
+# documentation, or SPDX/REUSE metadata gates.
+set -euo pipefail
+
+root_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$root_dir"
+
+dart format --set-exit-if-changed packages apps scripts tool test
+dart analyze
+dart run tool/check_reuse.dart
+dart run tool/check_docs.dart --skip-dartdoc

.github/workflows/ci.yml

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
 # Runs analyzer, tests, coverage, docs, and tagged desktop packaging.
 name: CI
 

REUSE.toml

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
+version = 1
+
+# The project license text is intentionally kept in the repository root as
+# LICENSE.md. These annotations cover package and app files that cannot safely
+# carry inline SPDX comments, such as generated platform files, binary icons,
+# JSON manifests, Xcode project files, and XML/plist resources.
+[[annotations]]
+path = [
+  "packages/**",
+  "apps/focus_flow_flutter/**",
+]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2026 FocusFlow contributors"
+SPDX-License-Identifier = "AGPL-3.0-only"

analysis_options.yaml

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
+include: package:lints/recommended.yaml
+
+analyzer:
+  language:
+    strict-casts: true
+    strict-inference: true
+    strict-raw-types: true
+
+linter:
+  rules:
+    public_member_api_docs: true
+    prefer_final_locals: true
+    prefer_final_fields: true
+    avoid_print: true

apps/focus_flow_flutter/LICENSE.md

@@ -0,0 +1,6 @@
+<!-- SPDX-FileCopyrightText: 2026 FocusFlow contributors -->
+<!-- SPDX-License-Identifier: AGPL-3.0-only -->
+
+# License
+
+This app uses the repository-level license at [../../LICENSE.md](../../LICENSE.md).

apps/focus_flow_flutter/README.md

@@ -1,3 +1,6 @@
+<!-- SPDX-FileCopyrightText: 2026 FocusFlow contributors -->
+<!-- SPDX-License-Identifier: AGPL-3.0-only -->
+
 # FocusFlow Flutter
 
 Flutter desktop app target for the FocusFlow UI work.

apps/focus_flow_flutter/analysis_options.yaml

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
 # This file configures the analyzer, which statically analyzes Dart code to
 # check for errors, warnings, and lints.
 #
@@ -9,6 +12,12 @@
 # packages, and plugins designed to encourage good coding practices.
 include: package:flutter_lints/flutter.yaml
 
+analyzer:
+  language:
+    strict-casts: true
+    strict-inference: true
+    strict-raw-types: true
+
 linter:
   # The lint rules applied to this project can be customized in the
   # section below to disable rules from the `package:flutter_lints/flutter.yaml`
@@ -22,6 +31,9 @@ linter:
   # producing the lint.
   rules:
     public_member_api_docs: true
+    prefer_final_locals: true
+    prefer_final_fields: true
+    avoid_print: true
     # avoid_print: false  # Uncomment to disable the `avoid_print` rule
     # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
 

apps/focus_flow_flutter/lib/app.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Exports the FocusFlow Flutter application entry points.
 library;
 

apps/focus_flow_flutter/lib/app/demo/demo_date_formatter.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../demo_scheduler_composition.dart';
 
 /// Formats a civil date as a long month/day/year label.
@@ -19,6 +22,8 @@ String _formatDateLabel(CivilDate date) {
   return '${months[date.month - 1]} ${date.day}, ${date.year}';
 }
 
+/// Top-level helper that performs the `_instant` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 DateTime _instant(CivilDate date, int hour, [int minute = 0]) {
   return DateTime.utc(date.year, date.month, date.day, hour, minute);
 }

apps/focus_flow_flutter/lib/app/demo/demo_seed_tasks.dart

@@ -1,5 +1,10 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../demo_scheduler_composition.dart';
 
+/// Top-level helper that performs the `_todaySeedTasks` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 List<Task> _todaySeedTasks(CivilDate date, DateTime createdAt) {
   return [
     _seedTask(
@@ -118,6 +123,8 @@ List<Task> _todaySeedTasks(CivilDate date, DateTime createdAt) {
   ];
 }
 
+/// Top-level helper that performs the `_seedTask` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Task _seedTask({
   required String id,
   required String title,

apps/focus_flow_flutter/lib/app/demo_scheduler_composition.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Composes the FocusFlow Flutter application around Demo Scheduler Composition.
 library;
 
@@ -12,6 +15,8 @@ part 'demo/demo_seed_tasks.dart';
 
 /// Wires the Flutter demo UI to in-memory scheduler application use cases.
 class DemoSchedulerComposition {
+  /// Creates a `DemoSchedulerComposition._` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   DemoSchedulerComposition._({
     required this.store,
     required this.todayQuery,

apps/focus_flow_flutter/lib/app/focus_flow_app.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Composes the FocusFlow Flutter application around Focus Flow App.
 library;
 
@@ -30,6 +33,8 @@ class FocusFlowApp extends StatelessWidget {
   /// Factory and controller bundle used by the app tree.
   final DemoSchedulerComposition composition;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return MaterialApp(

apps/focus_flow_flutter/lib/app/home/focus_flow_home.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../focus_flow_app.dart';
 
 /// Stateful home screen that owns the Today controller lifecycle.
@@ -8,6 +11,8 @@ class FocusFlowHome extends StatefulWidget {
   /// Factory and controller bundle used by the home screen.
   final DemoSchedulerComposition composition;
 
+  /// Creates the mutable state object used by this stateful widget.
+  /// Flutter calls this once for each mounted widget instance before lifecycle callbacks and builds begin.
   @override
   State<FocusFlowHome> createState() => _FocusFlowHomeState();
 }

apps/focus_flow_flutter/lib/app/home/focus_flow_home_state.dart

@@ -1,9 +1,21 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../focus_flow_app.dart';
 
+/// Private implementation type for `_FocusFlowHomeState` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _FocusFlowHomeState extends State<FocusFlowHome> {
+  /// Stores the `controller` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   late final TodayScreenController controller;
+
+  /// Stores the `commandController` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   late final SchedulerCommandController commandController;
 
+  /// Initializes state owned by this object before the first build.
+  /// Use this lifecycle point for controller setup, initial reads, and listener wiring that must happen once per mounted instance.
   @override
   void initState() {
     super.initState();
@@ -14,6 +26,8 @@ class _FocusFlowHomeState extends State<FocusFlowHome> {
     controller.load();
   }
 
+  /// Releases resources owned by this object before it leaves the tree.
+  /// Controllers, listeners, and other disposable collaborators should be cleaned up here to avoid stale callbacks.
   @override
   void dispose() {
     commandController.dispose();
@@ -21,6 +35,8 @@ class _FocusFlowHomeState extends State<FocusFlowHome> {
     super.dispose();
   }
 
+  /// Runs the `_toggleCardCompletion` operation and completes after its asynchronous work finishes.
+  /// Callers should await the returned future so repository writes, UI refreshes, and failure handling happen in a predictable order.
   Future<void> _toggleCardCompletion(TimelineCardModel card) async {
     if (!card.canToggleCompletion) {
       return;
@@ -35,6 +51,8 @@ class _FocusFlowHomeState extends State<FocusFlowHome> {
     }
   }
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Scaffold(

apps/focus_flow_flutter/lib/app/home/plan_issue.dart

@@ -1,10 +1,21 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../focus_flow_app.dart';
 
+/// Private implementation type for `_PlanIssue` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _PlanIssue extends StatelessWidget {
+  /// Creates a `_PlanIssue` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _PlanIssue({required this.message});
 
+  /// Stores the `message` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final String message;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Center(

apps/focus_flow_flutter/lib/app/home/today_screen_scaffold.dart

@@ -1,6 +1,13 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../focus_flow_app.dart';
 
+/// Private implementation type for `_TodayScreenScaffold` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TodayScreenScaffold extends StatefulWidget {
+  /// Creates a `_TodayScreenScaffold` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _TodayScreenScaffold({
     required this.data,
     required this.selectedCard,
@@ -9,12 +16,28 @@ class _TodayScreenScaffold extends StatefulWidget {
     required this.onClearSelection,
   });
 
+  /// Stores the `data` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TodayScreenData data;
+
+  /// Stores the `selectedCard` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel? selectedCard;
+
+  /// Stores the `onSelectCard` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final ValueChanged<TimelineCardModel> onSelectCard;
+
+  /// Stores the `onCompleteCard` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Future<void> Function(TimelineCardModel card) onCompleteCard;
+
+  /// Stores the `onClearSelection` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final VoidCallback onClearSelection;
 
+  /// Creates the mutable state object used by this stateful widget.
+  /// Flutter calls this once for each mounted widget instance before lifecycle callbacks and builds begin.
   @override
   State<_TodayScreenScaffold> createState() => _TodayScreenScaffoldState();
 }

apps/focus_flow_flutter/lib/app/home/today_screen_scaffold_state.dart

@@ -1,9 +1,21 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../focus_flow_app.dart';
 
+/// Private implementation type for `_TodayScreenScaffoldState` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TodayScreenScaffoldState extends State<_TodayScreenScaffold> {
+  /// Private state stored as `_timelineScrollTargetCardId` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   String? _timelineScrollTargetCardId;
+
+  /// Private state stored as `_timelineScrollRequest` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   var _timelineScrollRequest = 0;
 
+  /// Runs the `_showUpcomingRequiredTask` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _showUpcomingRequiredTask() {
     final targetCardId = widget.data.requiredBanner?.timelineCardId;
     if (targetCardId == null) {
@@ -15,6 +27,8 @@ class _TodayScreenScaffoldState extends State<_TodayScreenScaffold> {
     });
   }
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Stack(

apps/focus_flow_flutter/lib/composition/demo_scheduler_composition.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Provides compatibility composition exports for FocusFlow Flutter.
 library;
 

apps/focus_flow_flutter/lib/controllers/command/scheduler_command_callbacks.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../scheduler_command_controller.dart';
 
 /// Builds an application operation context for a UI command operation.

apps/focus_flow_flutter/lib/controllers/command/scheduler_command_controller_impl.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../scheduler_command_controller.dart';
 
 /// Runs scheduler write commands and exposes command state to widgets.
@@ -25,7 +28,13 @@ class SchedulerCommandController extends ChangeNotifier {
 
   /// Clock used by direct UI commands such as marking a task complete.
   final DateTime Function() now;
+
+  /// Private state stored as `_sequence` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   var _sequence = 0;
+
+  /// Private state stored as `_state` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   SchedulerCommandState _state = const SchedulerCommandIdle();
 
   /// Current command execution state.
@@ -146,6 +155,8 @@ class SchedulerCommandController extends ChangeNotifier {
     );
   }
 
+  /// Runs the `_run` operation and completes after its asynchronous work finishes.
+  /// Callers should await the returned future so repository writes, UI refreshes, and failure handling happen in a predictable order.
   Future<void> _run({
     required String label,
     required String successMessage,
@@ -173,15 +184,21 @@ class SchedulerCommandController extends ChangeNotifier {
     }
   }
 
+  /// Runs the `_nextOperationId` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   String _nextOperationId() {
     _sequence += 1;
     return 'ui-command-$_sequence';
   }
 
+  /// Runs the `_setState` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _setState(SchedulerCommandState next) {
     _state = next;
     notifyListeners();
   }
 
+  /// Runs the `_utcNow` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   static DateTime _utcNow() => DateTime.now().toUtc();
 }

apps/focus_flow_flutter/lib/controllers/command/scheduler_command_state.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../scheduler_command_controller.dart';
 
 /// Base state for scheduler command execution in the UI.

apps/focus_flow_flutter/lib/controllers/scheduler_command_controller.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Coordinates Scheduler Command Controller state for the FocusFlow Flutter UI.
 library;
 

apps/focus_flow_flutter/lib/controllers/scheduler_read_controller.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Coordinates Scheduler Read Controller state for the FocusFlow Flutter UI.
 library;
 
@@ -84,6 +87,8 @@ class ApplicationReadController<T> extends UiReadController<T> {
   /// Predicate used to classify a successful value as empty or populated.
   final EmptyPredicate<T> isEmpty;
 
+  /// Private state stored as `_state` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   SchedulerReadState<T> _state = SchedulerReadLoading<T>();
 
   /// Current read state.
@@ -116,6 +121,8 @@ class ApplicationReadController<T> extends UiReadController<T> {
   @override
   Future<void> retry() => load();
 
+  /// Runs the `_setState` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _setState(SchedulerReadState<T> next) {
     _state = next;
     notifyListeners();

apps/focus_flow_flutter/lib/controllers/today_screen_controller.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Coordinates Today Screen Controller state for the FocusFlow Flutter UI.
 library;
 
@@ -53,7 +56,12 @@ class TodayScreenController extends ChangeNotifier {
   /// Callback used to read Today state.
   final TodayStateReader read;
 
+  /// Private state stored as `_state` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   TodayScreenState _state = const TodayScreenLoading();
+
+  /// Private state stored as `_selectedCard` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   TimelineCardModel? _selectedCard;
 
   /// Current Today screen loading/data/failure state.
@@ -105,6 +113,8 @@ class TodayScreenController extends ChangeNotifier {
     notifyListeners();
   }
 
+  /// Runs the `_syncSelectedCard` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _syncSelectedCard(TodayScreenData data) {
     final selected = _selectedCard;
     if (selected == null) {

apps/focus_flow_flutter/lib/main.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Launches the FocusFlow Flutter desktop application.
 library;
 

apps/focus_flow_flutter/lib/models/today/required_banner_model.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../today_screen_models.dart';
 
 /// Presentation model for the next-required-task banner.

apps/focus_flow_flutter/lib/models/today/task_visual_kind.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../today_screen_models.dart';
 
 /// Visual category used to style timeline cards.

apps/focus_flow_flutter/lib/models/today/time/time_string_formatter.dart

@@ -1,5 +1,10 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../today_screen_models.dart';
 
+/// Top-level helper that performs the `_dateLabel` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _dateLabel(CivilDate date) {
   const months = [
     'January',
@@ -18,6 +23,8 @@ String _dateLabel(CivilDate date) {
   return '${months[date.month - 1]} ${date.day}, ${date.year}';
 }
 
+/// Top-level helper that performs the `_minutesSinceMidnight` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 int _minutesSinceMidnight(DateTime? value) {
   if (value == null) {
     return 0;
@@ -25,6 +32,8 @@ int _minutesSinceMidnight(DateTime? value) {
   return value.hour * 60 + value.minute;
 }
 
+/// Top-level helper that performs the `_formatTime` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _formatTime(DateTime? value) {
   if (value == null) {
     return '';

apps/focus_flow_flutter/lib/models/today/timeline_card_model.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../today_screen_models.dart';
 
 /// Presentation model for a single compact timeline card.

apps/focus_flow_flutter/lib/models/today/timeline_item_presentation_mapper.dart

@@ -1,5 +1,10 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../today_screen_models.dart';
 
+/// Top-level helper that performs the `_visualKindFor` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 TaskVisualKind _visualKindFor(TodayTimelineItem item) {
   if (item.taskStatus == TaskStatus.completed ||
       (item.taskType == TaskType.surprise &&
@@ -16,6 +21,8 @@ TaskVisualKind _visualKindFor(TodayTimelineItem item) {
   };
 }
 
+/// Top-level helper that performs the `_typeLabelFor` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _typeLabelFor(TaskType taskType, TaskVisualKind visualKind) {
   if (visualKind == TaskVisualKind.completedSurprise) {
     return 'Completed';
@@ -30,6 +37,8 @@ String _typeLabelFor(TaskType taskType, TaskVisualKind visualKind) {
   };
 }
 
+/// Top-level helper that performs the `_subtitleFor` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _subtitleFor(
   TodayTimelineItem item,
   TaskVisualKind visualKind,

apps/focus_flow_flutter/lib/models/today/timeline_range_model.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../today_screen_models.dart';
 
 /// Visible timeline range expressed as minutes since midnight.

apps/focus_flow_flutter/lib/models/today/today_screen_data.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../today_screen_models.dart';
 
 /// Presentation model for the compact Today screen.

apps/focus_flow_flutter/lib/models/today_screen_models.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Defines Today Screen Models models for the FocusFlow Flutter UI.
 library;
 

apps/focus_flow_flutter/lib/theme/focus_flow_theme.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Defines Focus Flow Theme styling for the FocusFlow Flutter UI.
 library;
 

apps/focus_flow_flutter/lib/theme/focus_flow_tokens.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Defines Focus Flow Tokens styling for the FocusFlow Flutter UI.
 library;
 

apps/focus_flow_flutter/lib/theme/scheduler_visual_tokens.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Defines Scheduler Visual Tokens styling for the FocusFlow Flutter UI.
 library;
 

apps/focus_flow_flutter/lib/widgets/app_shell.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the App Shell widget for the FocusFlow Flutter UI.
 library;
 
@@ -16,6 +19,8 @@ class AppShell extends StatelessWidget {
   /// Primary content widget displayed beside the sidebar.
   final Widget child;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return ColoredBox(

apps/focus_flow_flutter/lib/widgets/backlog_pane.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the Backlog Pane widget for the FocusFlow Flutter UI.
 library;
 
@@ -24,6 +27,8 @@ class BacklogPane extends StatelessWidget {
   /// Optional command controller for mutating backlog items.
   final SchedulerCommandController? commandController;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return ReadStateView<BacklogQueryResult>(
@@ -52,6 +57,8 @@ class BacklogContent extends StatelessWidget {
   /// Optional command controller for capture and scheduling actions.
   final SchedulerCommandController? commandController;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return ListView(
@@ -91,19 +98,29 @@ class QuickCaptureForm extends StatefulWidget {
   /// Command controller used to submit captured task titles.
   final SchedulerCommandController commandController;
 
+  /// Creates the mutable state object used by this stateful widget.
+  /// Flutter calls this once for each mounted widget instance before lifecycle callbacks and builds begin.
   @override
   State<QuickCaptureForm> createState() => _QuickCaptureFormState();
 }
 
+/// Private implementation type for `_QuickCaptureFormState` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _QuickCaptureFormState extends State<QuickCaptureForm> {
+  /// Stores the `titleController` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final titleController = TextEditingController();
 
+  /// Releases resources owned by this object before it leaves the tree.
+  /// Controllers, listeners, and other disposable collaborators should be cleaned up here to avoid stale callbacks.
   @override
   void dispose() {
     titleController.dispose();
     super.dispose();
   }
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Row(
@@ -142,6 +159,8 @@ class CommandStatusBanner extends StatelessWidget {
   /// Command controller whose state should be rendered.
   final SchedulerCommandController controller;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return AnimatedBuilder(

apps/focus_flow_flutter/lib/widgets/read_state_view.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the Read State View widget for the FocusFlow Flutter UI.
 library;
 
@@ -32,6 +35,8 @@ class ReadStateView<T> extends StatelessWidget {
   /// Builds the populated content for a read value.
   final Widget Function(BuildContext context, T value) dataBuilder;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return AnimatedBuilder(
@@ -82,6 +87,8 @@ class EmptyStatePanel extends StatelessWidget {
   /// Optional content shown alongside the empty-state panel.
   final Widget? child;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final panel = Padding(
@@ -138,6 +145,8 @@ class FailureStatePanel extends StatelessWidget {
   /// Callback invoked when the user retries the read.
   final Future<void> Function() onRetry;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Center(

apps/focus_flow_flutter/lib/widgets/required_banner.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the Required Banner widget for the FocusFlow Flutter UI.
 library;
 
@@ -17,6 +20,8 @@ class RequiredBanner extends StatelessWidget {
   /// Callback invoked when the highlighted required task should be shown.
   final VoidCallback? onShowUpcoming;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final banner = model;
@@ -97,44 +102,115 @@ class RequiredBanner extends StatelessWidget {
   }
 }
 
+/// Private implementation type for `_RequiredBannerMetrics` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _RequiredBannerMetrics {
+  /// Creates a `_RequiredBannerMetrics` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _RequiredBannerMetrics(this.scale);
 
+  /// Shared constant value for `referenceHeight`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const referenceHeight = 72.0;
+
+  /// Shared constant value for `_referenceWidth`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _referenceWidth = 760.0;
+
+  /// Shared constant value for `_minimumScale`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _minimumScale = 0.5;
 
+  /// Creates a `_RequiredBannerMetrics.fromWidth` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   factory _RequiredBannerMetrics.fromWidth(double width) {
     final safeWidth = width.isFinite ? width : _referenceWidth;
     final scale = (safeWidth / _referenceWidth).clamp(_minimumScale, 1.0);
     return _RequiredBannerMetrics(scale.toDouble());
   }
 
+  /// Stores the `scale` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final double scale;
 
+  /// Returns the derived `horizontalPadding` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get horizontalPadding => 18 * scale;
+
+  /// Returns the derived `bannerRadius` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get bannerRadius => FocusFlowTokens.bannerRadius * scale;
+
+  /// Returns the derived `borderWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get borderWidth => scale < 0.7 ? 0.8 : 1;
+
+  /// Returns the derived `iconCircleSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get iconCircleSize => 48 * scale;
+
+  /// Returns the derived `iconSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get iconSize => 24 * scale;
+
+  /// Returns the derived `iconGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get iconGap => 26 * scale;
+
+  /// Returns the derived `buttonGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get buttonGap => 20 * scale;
+
+  /// Returns the derived `textSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get textSize => (19 * scale).clamp(13.0, 14.0).toDouble();
+
+  /// Returns the derived `buttonWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get buttonWidth => 176 * scale;
+
+  /// Returns the derived `buttonHeight` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get buttonHeight => 46 * scale;
+
+  /// Returns the derived `buttonRadius` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get buttonRadius => FocusFlowTokens.smallButtonRadius * scale;
+
+  /// Returns the derived `buttonTextSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get buttonTextSize => (16 * scale).clamp(11.0, 12.5).toDouble();
+
+  /// Returns the derived `buttonIconSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get buttonIconSize => 20 * scale;
+
+  /// Returns the derived `buttonTextGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get buttonTextGap => 6 * scale;
+
+  /// Returns the derived `buttonPadding` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   EdgeInsets get buttonPadding => EdgeInsets.symmetric(horizontal: 12 * scale);
 }
 
+/// Private implementation type for `_UpcomingButton` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _UpcomingButton extends StatelessWidget {
+  /// Creates a `_UpcomingButton` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _UpcomingButton({required this.metrics, required this.onPressed});
 
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _RequiredBannerMetrics metrics;
+
+  /// Stores the `onPressed` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final VoidCallback? onPressed;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return OutlinedButton(

apps/focus_flow_flutter/lib/widgets/schedule_components.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the Schedule Components widget for the FocusFlow Flutter UI.
 library;
 
@@ -14,6 +17,8 @@ class CompactPanel extends StatelessWidget {
   /// Timeline items to display in compact form.
   final List<TodayTimelineItem> items;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     if (items.isEmpty) {
@@ -42,6 +47,8 @@ class TimelineRow extends StatelessWidget {
   /// Optional completion callback for eligible tasks.
   final Future<void> Function()? onDone;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final scheme = Theme.of(context).colorScheme;
@@ -104,19 +111,29 @@ class BacklogRow extends StatefulWidget {
   /// Optional callback that schedules the item for a duration in minutes.
   final Future<void> Function(int durationMinutes)? onSchedule;
 
+  /// Creates the mutable state object used by this stateful widget.
+  /// Flutter calls this once for each mounted widget instance before lifecycle callbacks and builds begin.
   @override
   State<BacklogRow> createState() => _BacklogRowState();
 }
 
+/// Private implementation type for `_BacklogRowState` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _BacklogRowState extends State<BacklogRow> {
+  /// Stores the `durationController` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final durationController = TextEditingController();
 
+  /// Releases resources owned by this object before it leaves the tree.
+  /// Controllers, listeners, and other disposable collaborators should be cleaned up here to avoid stale callbacks.
   @override
   void dispose() {
     durationController.dispose();
     super.dispose();
   }
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final scheme = Theme.of(context).colorScheme;
@@ -175,6 +192,8 @@ class StalenessMarker extends StatelessWidget {
   /// Staleness marker value to render.
   final BacklogStalenessMarker marker;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Icon(
@@ -192,6 +211,8 @@ class NoticeBanner extends StatelessWidget {
   /// Notice message to display.
   final String message;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Container(
@@ -216,6 +237,8 @@ String timeText(TimelineItem item) {
   return '${_clockText(start)}-${_clockText(end)}';
 }
 
+/// Top-level helper that performs the `_clockText` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _clockText(DateTime value) {
   final hour = value.hour.toString().padLeft(2, '0');
   final minute = value.minute.toString().padLeft(2, '0');

apps/focus_flow_flutter/lib/widgets/sidebar.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the Sidebar widget for the FocusFlow Flutter UI.
 library;
 
@@ -10,6 +13,8 @@ class Sidebar extends StatelessWidget {
   /// Creates the FocusFlow sidebar.
   const Sidebar({super.key});
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return DecoratedBox(
@@ -46,9 +51,15 @@ class Sidebar extends StatelessWidget {
   }
 }
 
+/// Private implementation type for `_WindowControls` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _WindowControls extends StatelessWidget {
+  /// Creates a `_WindowControls` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _WindowControls();
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return const Row(
@@ -63,11 +74,19 @@ class _WindowControls extends StatelessWidget {
   }
 }
 
+/// Private implementation type for `_WindowDot` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _WindowDot extends StatelessWidget {
+  /// Creates a `_WindowDot` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _WindowDot({required this.color});
 
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return DecoratedBox(
@@ -77,9 +96,15 @@ class _WindowDot extends StatelessWidget {
   }
 }
 
+/// Private implementation type for `_BrandRow` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _BrandRow extends StatelessWidget {
+  /// Creates a `_BrandRow` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _BrandRow();
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Row(
@@ -111,7 +136,11 @@ class _BrandRow extends StatelessWidget {
   }
 }
 
+/// Private implementation type for `_NavItem` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _NavItem extends StatelessWidget {
+  /// Creates a `_NavItem` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _NavItem({
     required this.label,
     required this.icon,
@@ -119,11 +148,24 @@ class _NavItem extends StatelessWidget {
     this.active = false,
   });
 
+  /// Stores the `label` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final String label;
+
+  /// Stores the `icon` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final IconData icon;
+
+  /// Stores the `onTap` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final VoidCallback onTap;
+
+  /// Stores the `active` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final bool active;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final color = active

apps/focus_flow_flutter/lib/widgets/task_selection/action_button.dart

@@ -1,11 +1,25 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_selection_modal.dart';
 
+/// Private implementation type for `_ActionButton` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _ActionButton extends StatelessWidget {
+  /// Creates a `_ActionButton` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _ActionButton({required this.icon, required this.label});
 
+  /// Stores the `icon` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final IconData icon;
+
+  /// Stores the `label` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final String label;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return OutlinedButton.icon(

apps/focus_flow_flutter/lib/widgets/task_selection/header_metadata.dart

@@ -1,10 +1,21 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_selection_modal.dart';
 
+/// Private implementation type for `_HeaderMetadata` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _HeaderMetadata extends StatelessWidget {
+  /// Creates a `_HeaderMetadata` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _HeaderMetadata({required this.card});
 
+  /// Stores the `card` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel card;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     const metadataStyle = TextStyle(

apps/focus_flow_flutter/lib/widgets/task_selection/info_tile.dart

@@ -1,11 +1,25 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_selection_modal.dart';
 
+/// Private implementation type for `_InfoTile` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _InfoTile extends StatelessWidget {
+  /// Creates a `_InfoTile` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _InfoTile({required this.child, required this.label});
 
+  /// Stores the `child` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Widget child;
+
+  /// Stores the `label` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final String label;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Container(

apps/focus_flow_flutter/lib/widgets/task_selection/modal_accent.dart

@@ -1,5 +1,10 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_selection_modal.dart';
 
+/// Top-level helper that performs the `_accentFor` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Color _accentFor(TaskVisualKind kind) {
   return switch (kind) {
     TaskVisualKind.flexible => FocusFlowTokens.flexibleGreen,

apps/focus_flow_flutter/lib/widgets/task_selection/modal_status_button.dart

@@ -1,16 +1,33 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_selection_modal.dart';
 
+/// Private implementation type for `_ModalStatusButton` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _ModalStatusButton extends StatelessWidget {
+  /// Creates a `_ModalStatusButton` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _ModalStatusButton({
     required this.card,
     required this.color,
     required this.onPressed,
   });
 
+  /// Stores the `card` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel card;
+
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
+
+  /// Stores the `onPressed` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final VoidCallback? onPressed;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final ring = Container(

apps/focus_flow_flutter/lib/widgets/task_selection_modal.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the Task Selection Modal widget for the FocusFlow Flutter UI.
 library;
 
@@ -33,6 +36,8 @@ class TaskSelectionModal extends StatelessWidget {
   /// Callback invoked when the status circle should toggle completion.
   final VoidCallback? onStatusPressed;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final accent = _accentFor(card.visualKind);

apps/focus_flow_flutter/lib/widgets/timeline/axis/timeline_grid.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../timeline_axis.dart';
 
 /// Background grid aligned to timeline tick marks.
@@ -11,6 +14,8 @@ class TimelineGrid extends StatelessWidget {
   /// Vertical inset before the first timeline tick.
   final double topInset;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return CustomPaint(

apps/focus_flow_flutter/lib/widgets/timeline/axis/timeline_grid_painter.dart

@@ -1,11 +1,25 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../timeline_axis.dart';
 
+/// Private implementation type for `_TimelineGridPainter` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TimelineGridPainter extends CustomPainter {
+  /// Creates a `_TimelineGridPainter` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _TimelineGridPainter({required this.geometry, required this.topInset});
 
+  /// Stores the `geometry` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineGeometry geometry;
+
+  /// Stores the `topInset` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final double topInset;
 
+  /// Performs the `paint` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   @override
   void paint(Canvas canvas, Size size) {
     final paint = Paint()
@@ -23,6 +37,8 @@ class _TimelineGridPainter extends CustomPainter {
     }
   }
 
+  /// Performs the `shouldRepaint` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   @override
   bool shouldRepaint(covariant _TimelineGridPainter oldDelegate) {
     return oldDelegate.geometry != geometry || oldDelegate.topInset != topInset;

apps/focus_flow_flutter/lib/widgets/timeline/difficulty_bars.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders Difficulty Bars pieces for the FocusFlow Flutter timeline.
 library;
 
@@ -49,6 +52,8 @@ class DifficultyBars extends StatelessWidget {
     };
   }
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return CustomPaint(
@@ -61,15 +66,26 @@ class DifficultyBars extends StatelessWidget {
   }
 }
 
+/// Private implementation type for `_DifficultyBarsPainter` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _DifficultyBarsPainter extends CustomPainter {
+  /// Creates a `_DifficultyBarsPainter` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _DifficultyBarsPainter({
     required this.filledCount,
     required this.color,
   });
 
+  /// Stores the `filledCount` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final int filledCount;
+
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
 
+  /// Performs the `paint` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   @override
   void paint(Canvas canvas, Size size) {
     final gap = size.width * 0.08;
@@ -98,6 +114,8 @@ class _DifficultyBarsPainter extends CustomPainter {
     }
   }
 
+  /// Performs the `shouldRepaint` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   @override
   bool shouldRepaint(covariant _DifficultyBarsPainter oldDelegate) {
     return oldDelegate.filledCount != filledCount || oldDelegate.color != color;

apps/focus_flow_flutter/lib/widgets/timeline/reward_icon.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders Reward Icon pieces for the FocusFlow Flutter timeline.
 library;
 
@@ -20,6 +23,8 @@ class RewardIcon extends StatelessWidget {
   /// Square size of the painted icon.
   final double size;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return CustomPaint(
@@ -29,11 +34,19 @@ class RewardIcon extends StatelessWidget {
   }
 }
 
+/// Private implementation type for `_RewardIconPainter` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _RewardIconPainter extends CustomPainter {
+  /// Creates a `_RewardIconPainter` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _RewardIconPainter(this.color);
 
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
 
+  /// Performs the `paint` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   @override
   void paint(Canvas canvas, Size size) {
     final paint = Paint()
@@ -59,6 +72,8 @@ class _RewardIconPainter extends CustomPainter {
     );
   }
 
+  /// Runs the `_drawSparkle` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _drawSparkle(Canvas canvas, Paint paint, Offset center, double radius) {
     final path = Path()
       ..moveTo(center.dx, center.dy - radius)
@@ -73,6 +88,8 @@ class _RewardIconPainter extends CustomPainter {
     canvas.drawPath(path, paint);
   }
 
+  /// Performs the `shouldRepaint` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   @override
   bool shouldRepaint(covariant _RewardIconPainter oldDelegate) {
     return oldDelegate.color != color;

apps/focus_flow_flutter/lib/widgets/timeline/task_card/card_colors.dart

@@ -1,16 +1,33 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_CardColors` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _CardColors {
+  /// Creates a `_CardColors` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _CardColors({
     required this.accent,
     required this.background,
     required this.reward,
   });
 
+  /// Stores the `accent` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color accent;
+
+  /// Stores the `background` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color background;
+
+  /// Stores the `reward` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color reward;
 
+  /// Creates a `_CardColors.forKind` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   factory _CardColors.forKind(TaskVisualKind kind) {
     return switch (kind) {
       TaskVisualKind.flexible => const _CardColors(

apps/focus_flow_flutter/lib/widgets/timeline/task_card/card_metrics.dart

@@ -1,14 +1,37 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_CardMetrics` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _CardMetrics {
+  /// Creates a `_CardMetrics` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _CardMetrics({required this.scale, required this.height});
 
+  /// Shared constant value for `_referenceWidth`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _referenceWidth = 640.0;
+
+  /// Shared constant value for `_referenceHeight`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _referenceHeight = 88.0;
+
+  /// Shared constant value for `_freeSlotReferenceHeight`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _freeSlotReferenceHeight = 108.0;
+
+  /// Shared constant value for `_compactHeightThreshold`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _compactHeightThreshold = 56.0;
+
+  /// Shared constant value for `_minimumScale`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _minimumScale = 0.16;
 
+  /// Creates a `_CardMetrics.fromConstraints` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   factory _CardMetrics.fromConstraints(
     BoxConstraints constraints, {
     required TaskVisualKind kind,
@@ -29,42 +52,122 @@ class _CardMetrics {
     return _CardMetrics(scale: scale.toDouble(), height: height);
   }
 
+  /// Stores the `scale` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final double scale;
+
+  /// Stores the `height` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final double height;
 
+  /// Returns the derived `isCompact` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   bool get isCompact => height < _compactHeightThreshold;
 
+  /// Returns the derived `cardRadius` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get cardRadius =>
       math.min(FocusFlowTokens.cardRadius * scale, height / 2);
+
+  /// Returns the derived `borderWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get borderWidth => math.max(0.75, 1.2 * scale);
+
+  /// Returns the derived `shadowBlur` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get shadowBlur => isCompact ? 0 : 18 * scale;
+
+  /// Returns the derived `shadowSpread` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get shadowSpread => isCompact ? 0 : scale;
+
+  /// Returns the derived `statusRingSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get statusRingSize {
     final availableHeight = math.max(8, height - padding.vertical);
     return math.min(24, availableHeight * 0.78).toDouble();
   }
 
+  /// Returns the derived `statusBorderWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get statusBorderWidth => math.max(1.4, statusRingSize * 0.08);
+
+  /// Returns the derived `statusIconSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get statusIconSize => statusRingSize * 0.58;
+
+  /// Returns the derived `statusGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get statusGap => isCompact ? 7 : 22 * scale;
+
+  /// Returns the derived `actionButtonSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get actionButtonSize => (30 * scale).clamp(14.0, 22.0).toDouble();
+
+  /// Returns the derived `actionIconSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get actionIconSize => (16 * scale).clamp(9.0, 13.0).toDouble();
+
+  /// Returns the derived `actionGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get actionGap => math.max(3, 5 * scale);
+
+  /// Returns the derived `actionsWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get actionsWidth => actionButtonSize * 4 + actionGap;
+
+  /// Returns the derived `indicatorTop` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get indicatorTop => isCompact ? 0 : math.max(1, 2 * scale);
+
+  /// Returns the derived `indicatorGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get indicatorGap => math.max(3, 5 * scale);
+
+  /// Returns the derived `rewardIconSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get rewardIconSize => 14;
+
+  /// Returns the derived `titleSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get titleSize => 10;
+
+  /// Returns the derived `metaSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get metaSize => 7;
+
+  /// Returns the derived `titleMetaGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get titleMetaGap => 4 * scale;
+
+  /// Returns the derived `freeSlotTimeGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get freeSlotTimeGap => 10 * scale;
+
+  /// Returns the derived `compactTextGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get compactTextGap => math.max(3, 8 * scale);
+
+  /// Returns the derived `indicatorWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get indicatorWidth =>
       rewardIconSize + indicatorGap + difficultySize.width;
+
+  /// Returns the derived `expandedTrailingReserve` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get expandedTrailingReserve =>
       indicatorWidth + math.max(8, 12 * scale);
+
+  /// Returns the derived `compactTrailingReserve` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get compactTrailingReserve => indicatorWidth + math.max(6, 8 * scale);
+
+  /// Returns the derived `difficultySize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   Size get difficultySize => Size(26, 14);
+
+  /// Returns the derived `padding` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   EdgeInsets get padding {
     if (isCompact) {
       return EdgeInsets.symmetric(

apps/focus_flow_flutter/lib/widgets/timeline/task_card/card_text.dart

@@ -1,16 +1,33 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_CardText` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _CardText extends StatelessWidget {
+  /// Creates a `_CardText` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _CardText({
     required this.card,
     required this.color,
     required this.metrics,
   });
 
+  /// Stores the `card` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel card;
+
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
+
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardMetrics metrics;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final titleStyle = TextStyle(

apps/focus_flow_flutter/lib/widgets/timeline/task_card/compact_card_text.dart

@@ -1,6 +1,13 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_CompactCardText` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _CompactCardText extends StatelessWidget {
+  /// Creates a `_CompactCardText` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _CompactCardText({
     required this.card,
     required this.color,
@@ -8,11 +15,24 @@ class _CompactCardText extends StatelessWidget {
     required this.onStatusPressed,
   });
 
+  /// Stores the `card` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel card;
+
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
+
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardMetrics metrics;
+
+  /// Stores the `onStatusPressed` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final VoidCallback? onStatusPressed;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final metaText = _compactMetaText(card);
@@ -83,6 +103,8 @@ class _CompactCardText extends StatelessWidget {
     );
   }
 
+  /// Runs the `_compactMetaText` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   String _compactMetaText(TimelineCardModel card) {
     if (card.visualKind == TaskVisualKind.freeSlot &&
         card.timeText.isNotEmpty) {

apps/focus_flow_flutter/lib/widgets/timeline/task_card/expanded_card_content.dart

@@ -1,6 +1,13 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_ExpandedCardContent` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _ExpandedCardContent extends StatelessWidget {
+  /// Creates a `_ExpandedCardContent` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _ExpandedCardContent({
     required this.card,
     required this.colors,
@@ -8,11 +15,24 @@ class _ExpandedCardContent extends StatelessWidget {
     required this.onStatusPressed,
   });
 
+  /// Stores the `card` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel card;
+
+  /// Stores the `colors` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardColors colors;
+
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardMetrics metrics;
+
+  /// Stores the `onStatusPressed` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final VoidCallback? onStatusPressed;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Row(

apps/focus_flow_flutter/lib/widgets/timeline/task_card/no_op_icon.dart

@@ -1,16 +1,33 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_NoOpIcon` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _NoOpIcon extends StatelessWidget {
+  /// Creates a `_NoOpIcon` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _NoOpIcon({
     required this.icon,
     required this.color,
     required this.metrics,
   });
 
+  /// Stores the `icon` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final IconData icon;
+
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
+
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardMetrics metrics;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Tooltip(

apps/focus_flow_flutter/lib/widgets/timeline/task_card/quick_actions.dart

@@ -1,6 +1,13 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_QuickActions` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _QuickActions extends StatelessWidget {
+  /// Creates a `_QuickActions` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _QuickActions({
     required this.color,
     required this.backgroundColor,
@@ -8,11 +15,24 @@ class _QuickActions extends StatelessWidget {
     required this.visible,
   });
 
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
+
+  /// Stores the `backgroundColor` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color backgroundColor;
+
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardMetrics metrics;
+
+  /// Stores the `visible` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final bool visible;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return ExcludeSemantics(

apps/focus_flow_flutter/lib/widgets/timeline/task_card/status_ring.dart

@@ -1,6 +1,13 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_StatusRing` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _StatusRing extends StatelessWidget {
+  /// Creates a `_StatusRing` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _StatusRing({
     required this.card,
     required this.color,
@@ -8,11 +15,24 @@ class _StatusRing extends StatelessWidget {
     this.onPressed,
   });
 
+  /// Stores the `card` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel card;
+
+  /// Stores the `color` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final Color color;
+
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardMetrics metrics;
+
+  /// Stores the `onPressed` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final VoidCallback? onPressed;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final border = Border.all(color: color, width: metrics.statusBorderWidth);

apps/focus_flow_flutter/lib/widgets/timeline/task_card/task_timeline_card_state.dart

@@ -1,8 +1,17 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_TaskTimelineCardState` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TaskTimelineCardState extends State<TaskTimelineCard> {
+  /// Private state stored as `_isHovered` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   bool _isHovered = false;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final card = widget.card;

apps/focus_flow_flutter/lib/widgets/timeline/task_card/trailing_controls.dart

@@ -1,6 +1,13 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../task_timeline_card.dart';
 
+/// Private implementation type for `_TrailingControls` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TrailingControls extends StatelessWidget {
+  /// Creates a `_TrailingControls` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _TrailingControls({
     required this.card,
     required this.colors,
@@ -8,11 +15,24 @@ class _TrailingControls extends StatelessWidget {
     required this.actionsVisible,
   });
 
+  /// Stores the `card` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel card;
+
+  /// Stores the `colors` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardColors colors;
+
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _CardMetrics metrics;
+
+  /// Stores the `actionsVisible` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final bool actionsVisible;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Row(

apps/focus_flow_flutter/lib/widgets/timeline/task_timeline_card.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders Task Timeline Card pieces for the FocusFlow Flutter timeline.
 library;
 
@@ -40,6 +43,8 @@ class TaskTimelineCard extends StatefulWidget {
   /// Callback invoked when the left status control is clicked.
   final VoidCallback? onStatusPressed;
 
+  /// Creates the mutable state object used by this stateful widget.
+  /// Flutter calls this once for each mounted widget instance before lifecycle callbacks and builds begin.
   @override
   State<TaskTimelineCard> createState() => _TaskTimelineCardState();
 }

apps/focus_flow_flutter/lib/widgets/timeline/timeline_axis.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders Timeline Axis pieces for the FocusFlow Flutter timeline.
 library;
 
@@ -20,6 +23,8 @@ class TimelineAxis extends StatelessWidget {
   /// Vertical inset before the first timeline tick.
   final double topInset;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     final ticks = geometry.ticks();

apps/focus_flow_flutter/lib/widgets/timeline/timeline_geometry.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders Timeline Geometry pieces for the FocusFlow Flutter timeline.
 library;
 
@@ -60,6 +63,8 @@ class TimelineGeometry {
     ];
   }
 
+  /// Performs the `operator ==` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   @override
   bool operator ==(Object other) {
     return identical(this, other) ||
@@ -70,6 +75,8 @@ class TimelineGeometry {
             other.minCardHeight == minCardHeight;
   }
 
+  /// Returns the derived `hashCode` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   @override
   int get hashCode {
     return Object.hash(
@@ -80,6 +87,8 @@ class TimelineGeometry {
     );
   }
 
+  /// Runs the `_labelFor` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   static String _labelFor(int minutes) {
     final hour24 = (minutes ~/ 60) % 24;
     final minute = minutes % 60;

apps/focus_flow_flutter/lib/widgets/timeline/timeline_view.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders Timeline View pieces for the FocusFlow Flutter timeline.
 library;
 
@@ -49,6 +52,8 @@ class TimelineView extends StatefulWidget {
   /// Monotonic request number that allows repeated jumps to the same card.
   final int scrollRequest;
 
+  /// Creates the mutable state object used by this stateful widget.
+  /// Flutter calls this once for each mounted widget instance before lifecycle callbacks and builds begin.
   @override
   State<TimelineView> createState() => _TimelineViewState();
 }

apps/focus_flow_flutter/lib/widgets/timeline/timeline_view/timeline_card_placement.dart

@@ -1,6 +1,13 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../timeline_view.dart';
 
+/// Private implementation type for `_TimelineCardPlacement` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TimelineCardPlacement {
+  /// Creates a `_TimelineCardPlacement` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _TimelineCardPlacement({
     required this.card,
     required this.lane,
@@ -9,14 +16,32 @@ class _TimelineCardPlacement {
     required this.height,
   });
 
+  /// Shared constant value for `_laneGap`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _laneGap = 8.0;
 
+  /// Stores the `card` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final TimelineCardModel card;
+
+  /// Stores the `lane` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final int lane;
+
+  /// Stores the `laneCount` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final int laneCount;
+
+  /// Stores the `top` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final double top;
+
+  /// Stores the `height` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final double height;
 
+  /// Performs the `withCard` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   _TimelineCardPlacement withCard(TimelineCardModel nextCard) {
     if (identical(card, nextCard)) {
       return this;
@@ -30,6 +55,8 @@ class _TimelineCardPlacement {
     );
   }
 
+  /// Performs the `pack` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   static List<_TimelineCardPlacement> pack(
     List<TimelineCardModel> cards, {
     required TimelineGeometry geometry,
@@ -74,6 +101,8 @@ class _TimelineCardPlacement {
     return placements;
   }
 
+  /// Runs the `_packGroup` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   static List<_TimelineCardPlacement> _packGroup(
     List<TimelineCardModel> group, {
     required TimelineGeometry geometry,
@@ -113,6 +142,8 @@ class _TimelineCardPlacement {
     ];
   }
 
+  /// Runs the `_visualStart` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   static double _visualStart(
     TimelineCardModel card,
     TimelineGeometry geometry,
@@ -120,21 +151,29 @@ class _TimelineCardPlacement {
     return geometry.yForMinutesSinceMidnight(card.startMinutes);
   }
 
+  /// Runs the `_visualEnd` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   static double _visualEnd(TimelineCardModel card, TimelineGeometry geometry) {
     final duration = card.endMinutes - card.startMinutes;
     return _visualStart(card, geometry) + geometry.heightForDuration(duration);
   }
 
+  /// Performs the `left` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   double left(double trackWidth) {
     final laneWidth = _laneWidth(trackWidth);
     final laneGap = _laneGapForWidth(trackWidth);
     return FocusFlowTokens.cardHorizontalPadding + lane * (laneWidth + laneGap);
   }
 
+  /// Performs the `width` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   double width(double trackWidth) {
     return _laneWidth(trackWidth);
   }
 
+  /// Runs the `_availableWidth` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   double _availableWidth(double trackWidth) {
     final availableWidth = trackWidth - FocusFlowTokens.cardHorizontalPadding;
     if (availableWidth < 0) {
@@ -143,12 +182,16 @@ class _TimelineCardPlacement {
     return availableWidth;
   }
 
+  /// Runs the `_laneWidth` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   double _laneWidth(double trackWidth) {
     final availableWidth = _availableWidth(trackWidth);
     final laneGap = _laneGapForWidth(trackWidth);
     return (availableWidth - laneGap * (laneCount - 1)) / laneCount;
   }
 
+  /// Runs the `_laneGapForWidth` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   double _laneGapForWidth(double trackWidth) {
     if (laneCount == 1) {
       return 0;

apps/focus_flow_flutter/lib/widgets/timeline/timeline_view/timeline_scroll_behavior.dart

@@ -1,8 +1,17 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../timeline_view.dart';
 
+/// Private implementation type for `_TimelineScrollBehavior` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TimelineScrollBehavior extends MaterialScrollBehavior {
+  /// Creates a `_TimelineScrollBehavior` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _TimelineScrollBehavior();
 
+  /// Returns the derived `dragDevices` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   @override
   Set<PointerDeviceKind> get dragDevices {
     return {...super.dragDevices, PointerDeviceKind.mouse};

apps/focus_flow_flutter/lib/widgets/timeline/timeline_view/timeline_view_state.dart

@@ -1,22 +1,53 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../timeline_view.dart';
 
+/// Private implementation type for `_TimelineViewState` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TimelineViewState extends State<TimelineView> {
+  /// Shared constant value for `_topInset`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _topInset = 12.0;
 
+  /// Private state stored as `_scrollController` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   final _scrollController = ScrollController();
+
+  /// Private state stored as `_didSetInitialScroll` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   bool _didSetInitialScroll = false;
+
+  /// Private state stored as `_handledScrollRequest` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   var _handledScrollRequest = 0;
+
+  /// Private state stored as `_geometry` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   late TimelineGeometry _geometry;
+
+  /// Private state stored as `_contentHeight` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   late double _contentHeight;
+
+  /// Private state stored as `_placements` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   late List<_TimelineCardPlacement> _placements;
+
+  /// Private state stored as `_cardsLayoutHash` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   late int _cardsLayoutHash;
 
+  /// Initializes state owned by this object before the first build.
+  /// Use this lifecycle point for controller setup, initial reads, and listener wiring that must happen once per mounted instance.
   @override
   void initState() {
     super.initState();
     _updateLayoutCache();
   }
 
+  /// Performs the `didUpdateWidget` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   @override
   void didUpdateWidget(covariant TimelineView oldWidget) {
     super.didUpdateWidget(oldWidget);
@@ -34,12 +65,16 @@ class _TimelineViewState extends State<TimelineView> {
     }
   }
 
+  /// Releases resources owned by this object before it leaves the tree.
+  /// Controllers, listeners, and other disposable collaborators should be cleaned up here to avoid stale callbacks.
   @override
   void dispose() {
     _scrollController.dispose();
     super.dispose();
   }
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return LayoutBuilder(
@@ -111,6 +146,8 @@ class _TimelineViewState extends State<TimelineView> {
     );
   }
 
+  /// Runs the `_updateLayoutCache` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _updateLayoutCache() {
     _geometry = TimelineGeometry(
       startMinutes: widget.range.startMinutes,
@@ -125,6 +162,8 @@ class _TimelineViewState extends State<TimelineView> {
     _cardsLayoutHash = _layoutHashFor(widget.cards);
   }
 
+  /// Runs the `_layoutHashFor` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   int _layoutHashFor(List<TimelineCardModel> cards) {
     return Object.hashAll(
       cards.map(
@@ -133,6 +172,8 @@ class _TimelineViewState extends State<TimelineView> {
     );
   }
 
+  /// Runs the `_refreshPlacementCards` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _refreshPlacementCards() {
     final cardsById = {for (final card in widget.cards) card.id: card};
     _placements = [
@@ -141,6 +182,8 @@ class _TimelineViewState extends State<TimelineView> {
     ];
   }
 
+  /// Runs the `_scheduleInitialScroll` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _scheduleInitialScroll(
     TimelineGeometry geometry,
     double viewportHeight,
@@ -168,6 +211,8 @@ class _TimelineViewState extends State<TimelineView> {
     });
   }
 
+  /// Runs the `_scheduleTargetScroll` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _scheduleTargetScroll(TimelineGeometry geometry) {
     final targetCardId = widget.scrollTargetCardId;
     if (targetCardId == null || widget.scrollRequest == _handledScrollRequest) {

apps/focus_flow_flutter/lib/widgets/today_pane.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the Today Pane widget for the FocusFlow Flutter UI.
 library;
 
@@ -24,6 +27,8 @@ class TodayPane extends StatelessWidget {
   /// Optional command controller for Today actions.
   final SchedulerCommandController? commandController;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return ReadStateView<TodayState>(
@@ -48,6 +53,8 @@ class TodayContent extends StatelessWidget {
   /// Optional command controller for completing tasks.
   final SchedulerCommandController? commandController;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return ListView(
@@ -75,6 +82,8 @@ class TodayContent extends StatelessWidget {
     );
   }
 
+  /// Runs the `_canComplete` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   bool _canComplete(TodayTimelineItem item) {
     return item.taskType == TaskType.flexible &&
         item.taskStatus == TaskStatus.planned &&

apps/focus_flow_flutter/lib/widgets/top_bar.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Renders the Top Bar widget for the FocusFlow Flutter UI.
 library;
 
@@ -18,6 +21,8 @@ class TopBar extends StatelessWidget {
   /// Date label shown beside the date navigation controls.
   final String dateLabel;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return LayoutBuilder(

apps/focus_flow_flutter/lib/widgets/top_bar/top_bar_icon_button.dart

@@ -1,16 +1,33 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../top_bar.dart';
 
+/// Private implementation type for `_IconButton` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _IconButton extends StatelessWidget {
+  /// Creates a `_IconButton` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _IconButton({
     required this.icon,
     required this.metrics,
     required this.onPressed,
   });
 
+  /// Stores the `icon` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final IconData icon;
+
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _TopBarMetrics metrics;
+
+  /// Stores the `onPressed` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final VoidCallback onPressed;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return IconButton(

apps/focus_flow_flutter/lib/widgets/top_bar/top_bar_metrics.dart

@@ -1,38 +1,116 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../top_bar.dart';
 
+/// Private implementation type for `_TopBarMetrics` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _TopBarMetrics {
+  /// Creates a `_TopBarMetrics` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _TopBarMetrics(this.scale);
 
+  /// Shared constant value for `referenceHeight`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const referenceHeight = 48.0;
+
+  /// Shared constant value for `_referenceWidth`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _referenceWidth = 900.0;
+
+  /// Shared constant value for `_minimumScale`.
+  /// The constant gives this repeated scheduler or UI value one documented source of truth instead of scattering literals across call sites.
   static const _minimumScale = 0.44;
 
+  /// Creates a `_TopBarMetrics.fromWidth` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   factory _TopBarMetrics.fromWidth(double width) {
     final safeWidth = width.isFinite ? width : _referenceWidth;
     final scale = (safeWidth / _referenceWidth).clamp(_minimumScale, 1.0);
     return _TopBarMetrics(scale.toDouble());
   }
 
+  /// Stores the `scale` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final double scale;
 
+  /// Returns the derived `titleWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get titleWidth => 112 * scale;
+
+  /// Returns the derived `titleSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get titleSize => FocusFlowTokens.pageTitleSize * scale;
+
+  /// Returns the derived `titleGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get titleGap => 30 * scale;
+
+  /// Returns the derived `controlHeight` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get controlHeight => referenceHeight * scale;
+
+  /// Returns the derived `iconButtonSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get iconButtonSize => referenceHeight * scale;
+
+  /// Returns the derived `iconSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get iconSize => 24 * scale;
+
+  /// Returns the derived `dateWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get dateWidth => 144 * scale;
+
+  /// Returns the derived `dateSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get dateSize => 17 * scale;
+
+  /// Returns the derived `modeWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get modeWidth => 220 * scale;
+
+  /// Returns the derived `modeHeight` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get modeHeight => referenceHeight * scale;
+
+  /// Returns the derived `modeLabelSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get modeLabelSize => 17 * scale;
+
+  /// Returns the derived `settingsGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get settingsGap => 28 * scale;
+
+  /// Returns the derived `settingsWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get settingsWidth => 136 * scale;
+
+  /// Returns the derived `settingsHeight` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get settingsHeight => referenceHeight * scale;
+
+  /// Returns the derived `settingsIconSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get settingsIconSize => 20 * scale;
+
+  /// Returns the derived `settingsTextSize` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get settingsTextSize => 15 * scale;
+
+  /// Returns the derived `settingsTextGap` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get settingsTextGap => 8 * scale;
+
+  /// Returns the derived `borderRadius` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get borderRadius => FocusFlowTokens.smallButtonRadius * scale;
+
+  /// Returns the derived `borderWidth` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   double get borderWidth => scale < 0.7 ? 0.8 : 1;
+
+  /// Returns the derived `buttonPadding` value for this object.
+  /// Keeping this as an accessor gives callers a stable read surface while the owning type controls how the value is calculated.
   EdgeInsets get buttonPadding => EdgeInsets.symmetric(horizontal: 12 * scale);
 }

apps/focus_flow_flutter/lib/widgets/top_bar/top_bar_mode_toggle.dart

@@ -1,10 +1,21 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../top_bar.dart';
 
+/// Private implementation type for `_ModeToggle` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _ModeToggle extends StatelessWidget {
+  /// Creates a `_ModeToggle` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _ModeToggle({required this.metrics});
 
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _TopBarMetrics metrics;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return Container(

apps/focus_flow_flutter/lib/widgets/top_bar/top_bar_settings_button.dart

@@ -1,10 +1,21 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../top_bar.dart';
 
+/// Private implementation type for `_SettingsButton` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _SettingsButton extends StatelessWidget {
+  /// Creates a `_SettingsButton` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _SettingsButton({required this.metrics});
 
+  /// Stores the `metrics` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final _TopBarMetrics metrics;
 
+  /// Builds the widget subtree for this component.
+  /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override
   Widget build(BuildContext context) {
     return OutlinedButton(

apps/focus_flow_flutter/pubspec.yaml

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
 name: focus_flow_flutter
 description: Provisional Flutter UI foundation for FocusFlow.
 publish_to: 'none'

apps/focus_flow_flutter/test/forbidden_imports_test.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Tests Forbidden Imports behavior in the FocusFlow Flutter app.
 library;
 
@@ -33,6 +36,8 @@ void main() {
   });
 }
 
+/// Top-level helper that performs the `_dartFiles` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Iterable<File> _dartFiles(Directory directory) {
   if (!directory.existsSync()) {
     return const <File>[];
@@ -43,6 +48,8 @@ Iterable<File> _dartFiles(Directory directory) {
       .where((file) => file.path.endsWith('.dart'));
 }
 
+/// Top-level helper that performs the `_forbiddenImportsFor` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 List<_ForbiddenImport> _forbiddenImportsFor(String relativePath) {
   return [
     const _ForbiddenImport(
@@ -69,12 +76,23 @@ List<_ForbiddenImport> _forbiddenImportsFor(String relativePath) {
   ];
 }
 
+/// Private implementation type for `_ForbiddenImport` in this library.
+/// It keeps supporting state and behavior scoped to the owning file so the public API stays focused on the scheduler concepts that callers use directly.
 class _ForbiddenImport {
+  /// Creates a `_ForbiddenImport` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const _ForbiddenImport(this.pattern, this.label);
 
+  /// Stores the `pattern` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final String pattern;
+
+  /// Stores the `label` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   final String label;
 
+  /// Performs the `matches` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
   bool matches(String contents) {
     return RegExp(
       r'''import\s+['"]''' + RegExp.escape(pattern),

apps/focus_flow_flutter/test/widget_test.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Tests Widget behavior in the FocusFlow Flutter app.
 library;
 
@@ -625,6 +628,8 @@ void main() {
   });
 }
 
+/// Top-level helper that performs the `_pumpPlanApp` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<void> _pumpPlanApp(
   WidgetTester tester, {
   DemoSchedulerComposition? composition,
@@ -637,10 +642,14 @@ Future<void> _pumpPlanApp(
   await tester.pumpAndSettle();
 }
 
+/// Top-level helper that performs the `_composition` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 DemoSchedulerComposition _composition() {
   return DemoSchedulerComposition.seeded(selectedDate: CivilDate(2025, 5, 20));
 }
 
+/// Top-level helper that performs the `_readSeededToday` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<TodayState> _readSeededToday() async {
   final composition = _composition();
   final result = await composition.todayQuery.execute(
@@ -652,15 +661,21 @@ Future<TodayState> _readSeededToday() async {
   return result.requireValue;
 }
 
+/// Top-level helper that performs the `_kindFor` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 TaskVisualKind _kindFor(TodayScreenData data, String id) {
   return data.cards.singleWhere((card) => card.id == id).visualKind;
 }
 
+/// Top-level helper that performs the `_scrollIntoView` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<void> _scrollIntoView(WidgetTester tester, ValueKey<String> key) async {
   await tester.ensureVisible(find.byKey(key));
   await tester.pumpAndSettle();
 }
 
+/// Top-level helper that performs the `_pumpTimelineCard` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<void> _pumpTimelineCard(
   WidgetTester tester, {
   required TimelineCardModel card,
@@ -688,6 +703,8 @@ Future<void> _pumpTimelineCard(
   await tester.pumpAndSettle();
 }
 
+/// Top-level helper that performs the `_pumpConstrainedWidget` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<void> _pumpConstrainedWidget(
   WidgetTester tester, {
   required Size size,
@@ -708,6 +725,8 @@ Future<void> _pumpConstrainedWidget(
   await tester.pumpAndSettle();
 }
 
+/// Top-level helper that performs the `_timelineCard` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 TimelineCardModel _timelineCard({
   required String id,
   required String title,

packages/scheduler_backup/LICENSE.md

@@ -0,0 +1,6 @@
+<!-- SPDX-FileCopyrightText: 2026 FocusFlow contributors -->
+<!-- SPDX-License-Identifier: AGPL-3.0-only -->
+
+# License
+
+This package uses the repository-level license at [../../LICENSE.md](../../LICENSE.md).

packages/scheduler_backup/analysis_options.yaml

@@ -1 +1,4 @@
-include: package:lints/recommended.yaml
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
+include: ../../analysis_options.yaml

packages/scheduler_backup/bin/backup.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Runs the Backup command for the Scheduler Backup package.
 library;
 
@@ -5,6 +8,8 @@ import 'dart:io';
 
 import 'package:scheduler_backup/backup.dart';
 
+/// Entry point for this executable Dart file.
+/// It wires the local command, test, or application behavior needed by this repository without exposing additional public API.
 Future<void> main(List<String> arguments) async {
   final passphrase = _option(arguments, '--passphrase') ??
       Platform.environment['SCHEDULER_BACKUP_PASSPHRASE'];
@@ -25,6 +30,8 @@ Future<void> main(List<String> arguments) async {
   }
 }
 
+/// Top-level helper that performs the `_option` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String? _option(List<String> arguments, String name) {
   final index = arguments.indexOf(name);
   if (index == -1 || index + 1 >= arguments.length) {

packages/scheduler_backup/lib/backup.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Encrypted SQLite backup helpers.
 library;
 

packages/scheduler_backup/lib/scheduler_backup.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Package-name entry point for scheduler backup helpers.
 library;
 

packages/scheduler_backup/lib/src/encrypted_backup.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Implements Encrypted Backup behavior for the Scheduler Backup package.
 library;
 
@@ -23,11 +26,30 @@ const defaultSchedulerDatabaseFileName = 'scheduler.sqlite';
 /// Default encrypted backup directory name under the scheduler data directory.
 const defaultSchedulerBackupDirectoryName = 'backups';
 
+/// Private file-level value for `_formatMagic`.
+/// Keeping this value near the helpers that use it avoids hidden global configuration while still preventing duplicate literals.
 const _formatMagic = 'ADHD_SCHEDULER_BACKUP_V1';
+
+/// Private file-level value for `_fileExtension`.
+/// Keeping this value near the helpers that use it avoids hidden global configuration while still preventing duplicate literals.
 const _fileExtension = '.db.enc';
+
+/// Private file-level value for `_kdfIterations`.
+/// Keeping this value near the helpers that use it avoids hidden global configuration while still preventing duplicate literals.
 const _kdfIterations = 200000;
+
+/// Private file-level value for `_saltLength`.
+/// Keeping this value near the helpers that use it avoids hidden global configuration while still preventing duplicate literals.
 const _saltLength = 16;
+
+/// Private file-level value for `_nonceLength`.
+/// Keeping this value near the helpers that use it avoids hidden global configuration while still preventing duplicate literals.
 const _nonceLength = 12;
+
+/// Private file-level value for `_keyLength`.
+/// Keeping this value near the helpers that use it avoids hidden global configuration while still preventing duplicate literals.
 const _keyLength = 32;
 
+/// Private file-level value for `_utf8`.
+/// Keeping this value near the helpers that use it avoids hidden global configuration while still preventing duplicate literals.
 final _utf8 = utf8.encoder;

packages/scheduler_backup/lib/src/encrypted_backup/codec/backup_encryption_codec.dart

@@ -1,5 +1,10 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../encrypted_backup.dart';
 
+/// Top-level helper that performs the `_encryptBytes` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<List<int>> _encryptBytes({
   required String passphrase,
   required List<int> plaintext,
@@ -26,6 +31,8 @@ Future<List<int>> _encryptBytes({
   return _utf8.convert(jsonEncode(envelope));
 }
 
+/// Top-level helper that performs the `_decryptBytes` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<List<int>> _decryptBytes({
   required String passphrase,
   required List<int> encoded,
@@ -56,6 +63,8 @@ Future<List<int>> _decryptBytes({
   }
 }
 
+/// Top-level helper that performs the `_deriveKey` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<SecretKey> _deriveKey({
   required String passphrase,
   required List<int> salt,
@@ -71,6 +80,8 @@ Future<SecretKey> _deriveKey({
   );
 }
 
+/// Top-level helper that performs the `_randomBytes` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 List<int> _randomBytes(int length) {
   final random = Random.secure();
   return Uint8List.fromList(

packages/scheduler_backup/lib/src/encrypted_backup/errors/backup_decryption_exception.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../encrypted_backup.dart';
 
 /// Thrown when an encrypted backup cannot be decrypted with the passphrase.
@@ -10,6 +13,8 @@ final class BackupDecryptionException implements Exception {
   /// Diagnostic text for logs and tests.
   final String message;
 
+  /// Converts scheduler data for `toString` without changing the source object.
+  /// Conversion helpers keep persistence and export shapes explicit so domain models do not depend on storage-specific details.
   @override
   String toString() => 'BackupDecryptionException: $message';
 }

packages/scheduler_backup/lib/src/encrypted_backup/errors/backup_exception.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../encrypted_backup.dart';
 
 /// Thrown when backup input paths or file contents are invalid.
@@ -8,6 +11,8 @@ final class BackupException implements Exception {
   /// Diagnostic text for logs and tests.
   final String message;
 
+  /// Converts scheduler data for `toString` without changing the source object.
+  /// Conversion helpers keep persistence and export shapes explicit so domain models do not depend on storage-specific details.
   @override
   String toString() => 'BackupException: $message';
 }

packages/scheduler_backup/lib/src/encrypted_backup/operations/encrypted_backup_operations.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../encrypted_backup.dart';
 
 /// Create an encrypted backup of the scheduler SQLite file.

packages/scheduler_backup/lib/src/encrypted_backup/paths/backup_file_names.dart

@@ -1,5 +1,10 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../encrypted_backup.dart';
 
+/// Top-level helper that performs the `_nextAvailableBackupFile` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Future<File> _nextAvailableBackupFile(Directory directory, String name) async {
   final preferred = File(_joinPath(directory.path, name));
   if (!await preferred.exists()) {
@@ -19,12 +24,18 @@ Future<File> _nextAvailableBackupFile(Directory directory, String name) async {
   }
 }
 
+/// Top-level helper that performs the `_backupTimestamp` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _backupTimestamp(DateTime value) {
   final local = value.toLocal();
   return '${_four(local.year)}${_two(local.month)}${_two(local.day)}_'
       '${_two(local.hour)}${_two(local.minute)}';
 }
 
+/// Top-level helper that performs the `_four` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _four(int value) => value.toString().padLeft(4, '0');
 
+/// Top-level helper that performs the `_two` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _two(int value) => value.toString().padLeft(2, '0');

packages/scheduler_backup/lib/src/encrypted_backup/paths/backup_paths.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../encrypted_backup.dart';
 
 /// Default scheduler SQLite database path.
@@ -18,6 +21,8 @@ Directory defaultSchedulerBackupDirectory() {
   ));
 }
 
+/// Top-level helper that performs the `_homeDirectory` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 Directory _homeDirectory() {
   final home = Platform.environment['HOME'] ??
       Platform.environment['USERPROFILE'] ??
@@ -28,6 +33,8 @@ Directory _homeDirectory() {
   return Directory(home);
 }
 
+/// Top-level helper that performs the `_joinPath` operation for this file.
+/// Keeping the helper private makes the surrounding flow easier to read while preventing unrelated libraries from depending on implementation detail.
 String _joinPath(String first, String second, [String? third]) {
   final separator = Platform.pathSeparator;
   final left = first.endsWith(separator)

packages/scheduler_backup/pubspec.yaml

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
 name: scheduler_backup
 description: Encrypted SQLite backup and restore helpers for the ADHD scheduler.
 version: 0.1.0

packages/scheduler_backup/test/encrypted_backup_test.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Tests Encrypted Backup behavior for the Scheduler Backup package.
 library;
 
@@ -7,6 +10,8 @@ import 'dart:io';
 import 'package:scheduler_backup/backup.dart';
 import 'package:test/test.dart';
 
+/// Entry point for this executable Dart file.
+/// It wires the local command, test, or application behavior needed by this repository without exposing additional public API.
 void main() {
   test('encrypted backup round trips a SQLite file using temp paths', () async {
     final temp =

packages/scheduler_core/LICENSE.md

@@ -0,0 +1,6 @@
+<!-- SPDX-FileCopyrightText: 2026 FocusFlow contributors -->
+<!-- SPDX-License-Identifier: AGPL-3.0-only -->
+
+# License
+
+This package uses the repository-level license at [../../LICENSE.md](../../LICENSE.md).

packages/scheduler_core/analysis_options.yaml

@@ -1,13 +1,4 @@
-include: package:lints/recommended.yaml
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
 
-analyzer:
-  language:
-    strict-casts: true
-    strict-inference: true
-    strict-raw-types: true
-
-linter:
-  rules:
-    prefer_final_locals: true
-    prefer_final_fields: true
-    avoid_print: true
+include: ../../analysis_options.yaml

packages/scheduler_core/lib/scheduler_core.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Defines the Scheduler Core public library for the Scheduler Core package.
 library;
 

packages/scheduler_core/lib/src/application_commands.dart

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /// Implements Application Commands behavior for the Scheduler Core package.
 library;
 

packages/scheduler_core/lib/src/application_commands/codes/application_command_code.dart

@@ -1,22 +1,75 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../application_commands.dart';
 
 /// Stable V1 application command identifiers.
 enum ApplicationCommandCode {
+  /// Selects the `quickCaptureToBacklog` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   quickCaptureToBacklog,
+
+  /// Selects the `quickCaptureToNextAvailableSlot` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   quickCaptureToNextAvailableSlot,
+
+  /// Selects the `scheduleBacklogItemToNextAvailableSlot` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   scheduleBacklogItemToNextAvailableSlot,
+
+  /// Selects the `pushFlexibleToNextAvailableSlot` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   pushFlexibleToNextAvailableSlot,
+
+  /// Selects the `pushFlexibleToTomorrowTopOfQueue` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   pushFlexibleToTomorrowTopOfQueue,
+
+  /// Selects the `moveFlexibleToBacklog` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   moveFlexibleToBacklog,
+
+  /// Selects the `completeFlexibleTask` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   completeFlexibleTask,
+
+  /// Selects the `uncompleteTask` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   uncompleteTask,
+
+  /// Selects the `applyRequiredTaskAction` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   applyRequiredTaskAction,
+
+  /// Selects the `logSurpriseTask` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   logSurpriseTask,
+
+  /// Selects the `createProtectedFreeSlot` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   createProtectedFreeSlot,
+
+  /// Selects the `updateProtectedFreeSlot` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   updateProtectedFreeSlot,
+
+  /// Selects the `removeProtectedFreeSlot` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   removeProtectedFreeSlot,
+
+  /// Selects the `breakUpTask` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   breakUpTask,
+
+  /// Selects the `completeChildTask` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   completeChildTask,
+
+  /// Selects the `completeParentTask` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   completeParentTask,
+
+  /// Selects the `completeParentFromChild` option from this enum.
+  /// Code should use this named value when it needs this exact scheduler state, presentation token, or persistence meaning.
   completeParentFromChild,
 }

packages/scheduler_core/lib/src/application_commands/messages/application_child_task_draft.dart

@@ -1,7 +1,12 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../application_commands.dart';
 
 /// Draft row for creating one child task from an application command.
 class ApplicationChildTaskDraft {
+  /// Creates a `ApplicationChildTaskDraft` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   const ApplicationChildTaskDraft({
     required this.title,
     this.priority,

packages/scheduler_core/lib/src/application_commands/messages/application_command_read_hint.dart

@@ -1,7 +1,12 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../application_commands.dart';
 
 /// Hint for read models that should be refreshed after a command.
 class ApplicationCommandReadHint {
+  /// Creates a `ApplicationCommandReadHint` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   ApplicationCommandReadHint({
     CivilDate? localDate,
     Iterable<CivilDate> affectedDates = const <CivilDate>[],

packages/scheduler_core/lib/src/application_commands/messages/application_command_result.dart

@@ -1,7 +1,12 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
 part of '../../application_commands.dart';
 
 /// Structured result returned by V1 application commands.
 class ApplicationCommandResult {
+  /// Creates a `ApplicationCommandResult` instance with the values required by its invariants.
+  /// Callers should pass already-normalized scheduler data because validation and defaulting belong at the model or service boundary, not in arbitrary UI code.
   ApplicationCommandResult({
     required this.commandCode,
     required String operationId,