docs: add CHANGELOG for v0.1.0 and v0.2.0

CHANGELOG.md

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+# Changelog
+
+All notable changes to `circuitforge-core` are documented here.
+Format follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+Versions follow [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [0.2.0] — 2026-04-02
+
+### Added
+
+**Orchestrator — auto service lifecycle**
+- `ServiceRegistry`: in-memory allocation tracker with state machine (`starting → running → idle → stopped`)
+- `NodeSelector`: warm-first GPU scoring — prefers nodes already running the requested model, falls back to highest free VRAM
+- `/api/services/{service}/allocate` coordinator endpoint: auto-selects best node, starts the llm_server process via agent, returns URL
+- `CFOrchClient`: sync + async context managers for coordinator allocation/release
+- Idle sweep in `AgentSupervisor`: stops instances that have been idle longer than `idle_stop_after_s` (default 600 s for vllm slot)
+- Background health probe loop: coordinator polls all `starting` instances every 5 s via `GET /health`; promotes to `running` on 200, marks `stopped` after 300 s timeout (closes #10)
+- Services table in coordinator dashboard HTML
+- `idle_stop_after_s` field in service profiles
+
+**LLM Router**
+- cf-orch allocation support in `LLMRouter` backends
+- VRAM lease acquisition/release wired through scheduler batch workers
+
+**Scheduler**
+- cf-orch VRAM lease per batch worker — prevents over-subscription
+- `join()` on batch worker threads during shutdown
+
+**HF inference server** (`llm_server.py`)
+- Generic HuggingFace `transformers` inference server replacing Ouro/vllm-Docker-specific code
+- `ProcessSpec` wiring in agent `service_manager.py`
+- Handles transformers 5.x `BatchEncoding` return type from `apply_chat_template`
+- Uses `dtype=` kwarg (replaces deprecated `torch_dtype=`)
+
+### Fixed
+
+- VRAM pre-flight threshold tightened: coordinator and `NodeSelector` now require full `service_max_mb` free (was `max_mb // 2`), preventing instances from starting on GPUs with insufficient headroom (closes #11 / related)
+- `ServiceInstance` now seeded correctly on first `/allocate` call
+- TTL sweep, immutability, and service-scoped release correctness in allocation path
+- Coordinator logger added for allocation path visibility
+
+### Changed
+
+- Removed Ouro/vllm-Docker specifics from llm_server — now a generic HF inference endpoint
+
+---
+
+## [0.1.0] — 2026-03-01
+
+### Added
+
+- Package scaffold (`circuitforge_core`)
+- DB base connection and migration runner
+- Generalised tier system with BYOK (bring your own key) and local-vision unlocks
+- LLM router extracted from Peregrine (fallback chain, vision-aware, BYOK support)
+- Config module and vision router stub
+- cf-orch orchestrator: coordinator (port 7700) + agent (port 7701)
+- Agent registration + VRAM lease wiring
+- Coordinator dashboard (HTML)