app/api/endpoints/community.py

@@ -0,0 +1,339 @@
+# app/api/endpoints/community.py
+# MIT License
+
+from __future__ import annotations
+
+import asyncio
+import logging
+import re
+from datetime import datetime, timezone
+
+from fastapi import APIRouter, Depends, HTTPException, Request, Response
+
+from app.cloud_session import CloudUser, get_session
+from app.core.config import settings
+from app.db.store import Store
+from app.services.community.feed import posts_to_rss
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/community", tags=["community"])
+
+# Module-level KiwiCommunityStore — None when COMMUNITY_DB_URL is not set.
+# Browse endpoints degrade gracefully to empty; write endpoints return 503.
+_community_store = None
+
+
+def _get_community_store():
+    """Return the module-level KiwiCommunityStore, or None if community DB is unavailable."""
+    return _community_store
+
+
+def init_community_store(community_db_url: str | None) -> None:
+    """Called from main.py lifespan when COMMUNITY_DB_URL is set."""
+    global _community_store
+    if not community_db_url:
+        logger.info(
+            "COMMUNITY_DB_URL not set — community write features disabled. "
+            "Browse still works via cloud fallback."
+        )
+        return
+    try:
+        from circuitforge_core.community import CommunityDB
+        from app.services.community.community_store import KiwiCommunityStore
+        db = CommunityDB(dsn=community_db_url)
+        db.run_migrations()
+        _community_store = KiwiCommunityStore(db)
+        logger.info("Community store initialized (PostgreSQL).")
+    except Exception as exc:
+        logger.warning("Community store init failed — community writes disabled: %s", exc)
+
+
+# ── Browse (no auth required — Free tier) ────────────────────────────────────
+
+@router.get("/posts")
+async def list_posts(
+    post_type: str | None = None,
+    dietary_tags: str | None = None,
+    allergen_exclude: str | None = None,
+    page: int = 1,
+    page_size: int = 20,
+):
+    """Paginated community post list. Available on all tiers (read-only)."""
+    store = _get_community_store()
+    if store is None:
+        return {"posts": [], "total": 0, "note": "Community DB not available on this instance."}
+
+    dietary = [t.strip() for t in dietary_tags.split(",")] if dietary_tags else None
+    allergen_ex = [t.strip() for t in allergen_exclude.split(",")] if allergen_exclude else None
+    offset = (page - 1) * min(page_size, 100)
+
+    posts = await asyncio.to_thread(
+        store.list_posts,
+        limit=min(page_size, 100),
+        offset=offset,
+        post_type=post_type,
+        dietary_tags=dietary,
+        allergen_exclude=allergen_ex,
+    )
+    return {"posts": [_post_to_dict(p) for p in posts], "page": page, "page_size": page_size}
+
+
+@router.get("/posts/{slug}")
+async def get_post(slug: str, request: Request):
+    """Single post. Returns AP JSON-LD when Accept: application/activity+json."""
+    store = _get_community_store()
+    if store is None:
+        raise HTTPException(status_code=503, detail="Community DB not available on this instance.")
+
+    post = await asyncio.to_thread(store.get_post_by_slug, slug)
+    if post is None:
+        raise HTTPException(status_code=404, detail="Post not found.")
+
+    accept = request.headers.get("accept", "")
+    if "application/activity+json" in accept:
+        from app.services.community.ap_compat import post_to_ap_json_ld
+        base_url = str(request.base_url).rstrip("/")
+        return post_to_ap_json_ld(_post_to_dict(post), base_url=base_url)
+
+    return _post_to_dict(post)
+
+
+@router.get("/feed.rss")
+async def get_rss_feed(request: Request):
+    """RSS 2.0 feed of recent community posts."""
+    store = _get_community_store()
+    posts_data: list[dict] = []
+    if store is not None:
+        posts = await asyncio.to_thread(store.list_posts, limit=50)
+        posts_data = [_post_to_dict(p) for p in posts]
+
+    base_url = str(request.base_url).rstrip("/")
+    rss = posts_to_rss(posts_data, base_url=base_url)
+    return Response(content=rss, media_type="application/rss+xml; charset=utf-8")
+
+
+@router.get("/local-feed")
+async def local_feed():
+    """LAN peer endpoint: last 50 posts from this instance. No auth required."""
+    store = _get_community_store()
+    if store is None:
+        return []
+    posts = await asyncio.to_thread(store.list_posts, limit=50)
+    return [_post_to_dict(p) for p in posts]
+
+
+# ── Write endpoints (auth required) ──────────────────────────────────────────
+
+@router.post("/posts", status_code=201)
+async def publish_post(
+    body: dict,
+    session: CloudUser = Depends(get_session),
+):
+    """Publish a plan or outcome to the community feed. Requires Paid tier."""
+    from app.tiers import can_use
+    if not can_use("community_publish", session.tier, session.has_byok):
+        raise HTTPException(status_code=402, detail="Community publishing requires Paid tier.")
+
+    store = _get_community_store()
+    if store is None:
+        raise HTTPException(
+            status_code=503,
+            detail="This Kiwi instance is not connected to a community database. "
+                   "Publishing is only available on cloud instances.",
+        )
+
+    # Resolve pseudonym (first-time setup inline via publish modal)
+    from app.services.community.community_store import get_or_create_pseudonym
+    db_path = session.db
+
+    def _get_pseudonym():
+        s = Store(db_path)
+        try:
+            return get_or_create_pseudonym(
+                store=s,
+                directus_user_id=session.user_id,
+                requested_name=body.get("pseudonym_name"),
+            )
+        finally:
+            s.close()
+
+    pseudonym = await asyncio.to_thread(_get_pseudonym)
+
+    # Compute element snapshot from corpus recipes in the plan
+    recipe_ids = [slot["recipe_id"] for slot in body.get("slots", []) if slot.get("recipe_id")]
+    from app.services.community.element_snapshot import compute_snapshot
+
+    def _snapshot():
+        s = Store(db_path)
+        try:
+            return compute_snapshot(recipe_ids=recipe_ids, store=s)
+        finally:
+            s.close()
+
+    snapshot = await asyncio.to_thread(_snapshot)
+
+    # Build deterministic slug
+    slug_title = re.sub(r"[^a-z0-9]+", "-", (body.get("title") or "plan").lower()).strip("-")
+    today = datetime.now(timezone.utc).strftime("%Y-%m-%d")
+    post_type = body.get("post_type", "plan")
+    slug = f"kiwi-{_post_type_prefix(post_type)}-{pseudonym.lower().replace(' ', '')}-{today}-{slug_title}"[:120]
+
+    try:
+        from circuitforge_core.community.models import CommunityPost
+        post = CommunityPost(
+            slug=slug,
+            pseudonym=pseudonym,
+            post_type=post_type,
+            published=datetime.now(timezone.utc),
+            title=body.get("title", "Untitled"),
+            description=body.get("description"),
+            photo_url=body.get("photo_url"),
+            slots=body.get("slots", []),
+            recipe_id=body.get("recipe_id"),
+            recipe_name=body.get("recipe_name"),
+            level=body.get("level"),
+            outcome_notes=body.get("outcome_notes"),
+            seasoning_score=snapshot.seasoning_score,
+            richness_score=snapshot.richness_score,
+            brightness_score=snapshot.brightness_score,
+            depth_score=snapshot.depth_score,
+            aroma_score=snapshot.aroma_score,
+            structure_score=snapshot.structure_score,
+            texture_profile=snapshot.texture_profile,
+            dietary_tags=list(snapshot.dietary_tags),
+            allergen_flags=list(snapshot.allergen_flags),
+            flavor_molecules=list(snapshot.flavor_molecules),
+            fat_pct=snapshot.fat_pct,
+            protein_pct=snapshot.protein_pct,
+            moisture_pct=snapshot.moisture_pct,
+        )
+    except ImportError:
+        raise HTTPException(status_code=503, detail="Community module not available.")
+
+    inserted = await asyncio.to_thread(store.insert_post, post)
+    return _post_to_dict(inserted)
+
+
+@router.delete("/posts/{slug}", status_code=204)
+async def delete_post(slug: str, session: CloudUser = Depends(get_session)):
+    """Hard-delete a post. Only succeeds if the caller is the post author (pseudonym match)."""
+    store = _get_community_store()
+    if store is None:
+        raise HTTPException(status_code=503, detail="Community DB not available.")
+
+    def _get_pseudonym():
+        s = Store(session.db)
+        try:
+            return s.get_current_pseudonym(session.user_id)
+        finally:
+            s.close()
+
+    pseudonym = await asyncio.to_thread(_get_pseudonym)
+    if not pseudonym:
+        raise HTTPException(status_code=400, detail="No pseudonym set. Cannot delete posts.")
+
+    deleted = await asyncio.to_thread(store.delete_post, slug=slug, pseudonym=pseudonym)
+    if not deleted:
+        raise HTTPException(status_code=404, detail="Post not found or you are not the author.")
+
+
+@router.post("/posts/{slug}/fork", status_code=201)
+async def fork_post(slug: str, session: CloudUser = Depends(get_session)):
+    """Exact-copy fork: creates a new meal plan in the caller's DB with matching slots. Free."""
+    store = _get_community_store()
+    if store is None:
+        raise HTTPException(status_code=503, detail="Community DB not available.")
+
+    post = await asyncio.to_thread(store.get_post_by_slug, slug)
+    if post is None:
+        raise HTTPException(status_code=404, detail="Post not found.")
+    if post.post_type != "plan":
+        raise HTTPException(status_code=400, detail="Only plan posts can be forked as a meal plan.")
+
+    from datetime import date
+
+    def _create_plan():
+        s = Store(session.db)
+        try:
+            week_start = date.today().strftime("%Y-%m-%d")
+            meal_types = list({slot["meal_type"] for slot in post.slots}) or ["dinner"]
+            plan = s.create_meal_plan(week_start=week_start, meal_types=meal_types)
+            for slot in post.slots:
+                s.assign_recipe_to_slot(
+                    plan_id=plan["id"],
+                    day_of_week=slot["day"],
+                    meal_type=slot["meal_type"],
+                    recipe_id=slot["recipe_id"],
+                )
+            return plan
+        finally:
+            s.close()
+
+    plan = await asyncio.to_thread(_create_plan)
+    return {"plan_id": plan["id"], "week_start": plan["week_start"], "forked_from": slug}
+
+
+@router.post("/posts/{slug}/fork-adapt", status_code=201)
+async def fork_adapt_post(slug: str, session: CloudUser = Depends(get_session)):
+    """Fork with LLM pantry adaptation. Paid/BYOK. Returns suggestions for user review."""
+    from app.tiers import can_use
+    if not can_use("community_fork_adapt", session.tier, session.has_byok):
+        raise HTTPException(status_code=402, detail="Fork with adaptation requires Paid tier or BYOK.")
+
+    store = _get_community_store()
+    if store is None:
+        raise HTTPException(status_code=503, detail="Community DB not available.")
+
+    post = await asyncio.to_thread(store.get_post_by_slug, slug)
+    if post is None:
+        raise HTTPException(status_code=404, detail="Post not found.")
+
+    # BSL 1.1 call site — LLM adaptation
+    from app.services.meal_plan.llm_planner import adapt_plan_to_pantry
+    suggestions = await adapt_plan_to_pantry(
+        slots=list(post.slots),
+        db_path=session.db,
+        tier=session.tier,
+        has_byok=session.has_byok,
+    )
+    return {"suggestions": suggestions, "forked_from": slug}
+
+
+# ── Helpers ───────────────────────────────────────────────────────────────────
+
+def _post_to_dict(post) -> dict:
+    """Convert a CommunityPost (frozen dataclass) to a JSON-serializable dict."""
+    return {
+        "slug": post.slug,
+        "pseudonym": post.pseudonym,
+        "post_type": post.post_type,
+        "published": post.published.isoformat() if hasattr(post.published, "isoformat") else str(post.published),
+        "title": post.title,
+        "description": post.description,
+        "photo_url": post.photo_url,
+        "slots": list(post.slots),
+        "recipe_id": post.recipe_id,
+        "recipe_name": post.recipe_name,
+        "level": post.level,
+        "outcome_notes": post.outcome_notes,
+        "element_profiles": {
+            "seasoning_score": post.seasoning_score,
+            "richness_score": post.richness_score,
+            "brightness_score": post.brightness_score,
+            "depth_score": post.depth_score,
+            "aroma_score": post.aroma_score,
+            "structure_score": post.structure_score,
+            "texture_profile": post.texture_profile,
+        },
+        "dietary_tags": list(post.dietary_tags),
+        "allergen_flags": list(post.allergen_flags),
+        "flavor_molecules": list(post.flavor_molecules),
+        "fat_pct": post.fat_pct,
+        "protein_pct": post.protein_pct,
+        "moisture_pct": post.moisture_pct,
+    }
+
+
+def _post_type_prefix(post_type: str) -> str:
+    return {"plan": "plan", "recipe_success": "success", "recipe_blooper": "blooper"}.get(post_type, "post")

app/api/routes.py

@@ -1,5 +1,6 @@
 from fastapi import APIRouter
 from app.api.endpoints import health, receipts, export, inventory, ocr, recipes, settings, staples, feedback, household, saved_recipes, meal_plans
+from app.api.endpoints.community import router as community_router
 
 api_router = APIRouter()
 
@@ -15,3 +16,4 @@ api_router.include_router(feedback.router,      prefix="/feedback",     tags=["f
 api_router.include_router(household.router,     prefix="/household",    tags=["household"])
 api_router.include_router(saved_recipes.router, prefix="/recipes/saved", tags=["saved-recipes"])
 api_router.include_router(meal_plans.router,    prefix="/meal-plans",   tags=["meal-plans"])
+api_router.include_router(community_router)

app/core/config.py

@@ -53,6 +53,17 @@ class Settings:
     # Feature flags
     ENABLE_OCR: bool = os.environ.get("ENABLE_OCR", "false").lower() in ("1", "true", "yes")
 
+    # Community feature
+    # COMMUNITY_DB_URL: unset = community writes disabled (local/offline mode, fail soft)
+    COMMUNITY_DB_URL: str | None = os.environ.get("COMMUNITY_DB_URL") or None
+    COMMUNITY_PSEUDONYM_SALT: str = os.environ.get(
+        "COMMUNITY_PSEUDONYM_SALT", "kiwi-default-salt-change-in-prod"
+    )
+    COMMUNITY_CLOUD_FEED_URL: str = os.environ.get(
+        "COMMUNITY_CLOUD_FEED_URL",
+        "https://menagerie.circuitforge.tech/kiwi/api/v1/community/posts",
+    )
+
     # Runtime
     DEBUG: bool = os.environ.get("DEBUG", "false").lower() in ("1", "true", "yes")
     CLOUD_MODE: bool = os.environ.get("CLOUD_MODE", "false").lower() in ("1", "true", "yes")

app/db/migrations/026_community_pseudonyms.sql

@@ -0,0 +1,21 @@
+-- 026_community_pseudonyms.sql
+-- Per-user pseudonym store: maps the user's chosen community display name
+-- to their Directus user ID. This table lives in per-user kiwi.db only.
+-- It is NEVER replicated to the community PostgreSQL — pseudonym isolation is by design.
+--
+-- A user may have one active pseudonym. Old pseudonyms are retained for reference
+-- (posts published under them keep their pseudonym attribution) but only one is
+-- flagged as current (is_current = 1).
+
+CREATE TABLE IF NOT EXISTS community_pseudonyms (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    pseudonym       TEXT NOT NULL,
+    directus_user_id TEXT NOT NULL,
+    is_current      INTEGER NOT NULL DEFAULT 1 CHECK (is_current IN (0, 1)),
+    created_at      TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+-- Only one pseudonym can be current at a time per user
+CREATE UNIQUE INDEX IF NOT EXISTS idx_community_pseudonyms_current
+    ON community_pseudonyms (directus_user_id)
+    WHERE is_current = 1;

app/db/store.py

@@ -1128,3 +1128,31 @@ class Store:
         )
         self.conn.commit()
         return self._fetch_one("SELECT * FROM prep_tasks WHERE id = ?", (task_id,))
+
+    # ── Community pseudonyms ──────────────────────────────────────────────────
+
+    def get_current_pseudonym(self, directus_user_id: str) -> str | None:
+        """Return the current community pseudonym for this user, or None if not set."""
+        cur = self.conn.execute(
+            "SELECT pseudonym FROM community_pseudonyms "
+            "WHERE directus_user_id = ? AND is_current = 1 LIMIT 1",
+            (directus_user_id,),
+        )
+        row = cur.fetchone()
+        return row["pseudonym"] if row else None
+
+    def set_pseudonym(self, directus_user_id: str, pseudonym: str) -> None:
+        """Set the current community pseudonym for this user.
+
+        Marks any previous pseudonym as non-current (retains history for attribution).
+        """
+        self.conn.execute(
+            "UPDATE community_pseudonyms SET is_current = 0 WHERE directus_user_id = ?",
+            (directus_user_id,),
+        )
+        self.conn.execute(
+            "INSERT INTO community_pseudonyms (pseudonym, directus_user_id, is_current) "
+            "VALUES (?, ?, 1)",
+            (pseudonym, directus_user_id),
+        )
+        self.conn.commit()

app/main.py

@@ -20,6 +20,10 @@ async def lifespan(app: FastAPI):
     settings.ensure_dirs()
     register_kiwi_programs()
 
+    # Initialize community store (fail-soft if COMMUNITY_DB_URL not set)
+    from app.api.endpoints.community import init_community_store
+    init_community_store(settings.COMMUNITY_DB_URL)
+
     # Start LLM background task scheduler
     from app.tasks.scheduler import get_scheduler
     get_scheduler(settings.DB_PATH)

app/services/community/ap_compat.py

@@ -0,0 +1,44 @@
+# app/services/community/ap_compat.py
+# MIT License — AP (ActivityPub) scaffold only (no actor, inbox, outbox)
+
+from __future__ import annotations
+
+from datetime import datetime, timezone
+
+
+def post_to_ap_json_ld(post: dict, base_url: str) -> dict:
+    """Serialize a community post dict to an ActivityPub-compatible JSON-LD Note.
+
+    This is a read-only scaffold. No AP actor, inbox, or outbox is implemented.
+    The slug URI is stable so a future full AP implementation can envelope posts
+    without a database migration.
+    """
+    slug = post["slug"]
+    published = post.get("published")
+    if isinstance(published, datetime):
+        published_str = published.astimezone(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
+    else:
+        published_str = str(published)
+
+    dietary_tags: list[str] = post.get("dietary_tags") or []
+    tags = [{"type": "Hashtag", "name": "#kiwi"}]
+    for tag in dietary_tags:
+        tags.append({"type": "Hashtag", "name": f"#{tag.replace('-', '').replace(' ', '')}"})
+
+    return {
+        "@context": "https://www.w3.org/ns/activitystreams",
+        "type": "Note",
+        "id": f"{base_url}/api/v1/community/posts/{slug}",
+        "attributedTo": post.get("pseudonym", "anonymous"),
+        "content": _build_content(post),
+        "published": published_str,
+        "tag": tags,
+    }
+
+
+def _build_content(post: dict) -> str:
+    title = post.get("title") or "Untitled"
+    desc = post.get("description")
+    if desc:
+        return f"{title} — {desc}"
+    return title

app/services/community/community_store.py

@@ -0,0 +1,108 @@
+# app/services/community/community_store.py
+# MIT License
+
+from __future__ import annotations
+
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def get_or_create_pseudonym(
+    store,
+    directus_user_id: str,
+    requested_name: str | None,
+) -> str:
+    """Return the user's current pseudonym, creating it if it doesn't exist.
+
+    If the user has an existing pseudonym, return it (ignore requested_name).
+    If not, create using requested_name (must be provided for first-time setup).
+
+    Raises ValueError if no existing pseudonym and requested_name is None or blank.
+    """
+    existing = store.get_current_pseudonym(directus_user_id)
+    if existing:
+        return existing
+
+    if not requested_name or not requested_name.strip():
+        raise ValueError(
+            "A pseudonym is required for first publish. "
+            "Pass requested_name with your chosen display name."
+        )
+
+    name = requested_name.strip()
+    if "@" in name:
+        raise ValueError(
+            "Pseudonym must not contain '@' — use a display name, not an email address."
+        )
+
+    store.set_pseudonym(directus_user_id, name)
+    return name
+
+
+try:
+    from circuitforge_core.community import SharedStore, CommunityPost
+
+    class KiwiCommunityStore(SharedStore):
+        """Kiwi-specific community store: adds kiwi-domain query methods on top of SharedStore."""
+
+        def list_meal_plans(
+            self,
+            limit: int = 20,
+            offset: int = 0,
+            dietary_tags: list[str] | None = None,
+            allergen_exclude: list[str] | None = None,
+        ) -> list[CommunityPost]:
+            return self.list_posts(
+                limit=limit,
+                offset=offset,
+                post_type="plan",
+                dietary_tags=dietary_tags,
+                allergen_exclude=allergen_exclude,
+                source_product="kiwi",
+            )
+
+        def list_outcomes(
+            self,
+            limit: int = 20,
+            offset: int = 0,
+            post_type: str | None = None,
+        ) -> list[CommunityPost]:
+            if post_type in ("recipe_success", "recipe_blooper"):
+                return self.list_posts(
+                    limit=limit, offset=offset,
+                    post_type=post_type, source_product="kiwi",
+                )
+            # Fetch both types and merge by published date
+            success = self.list_posts(
+                limit=limit, offset=0, post_type="recipe_success", source_product="kiwi",
+            )
+            bloopers = self.list_posts(
+                limit=limit, offset=0, post_type="recipe_blooper", source_product="kiwi",
+            )
+            merged = sorted(success + bloopers, key=lambda p: p.published, reverse=True)
+            return merged[:limit]
+
+except ImportError:
+    # cf-core community module not yet merged — stub for local dev without community DB
+    class KiwiCommunityStore:  # type: ignore[no-redef]
+        def __init__(self, *args, **kwargs):
+            pass
+
+        def list_meal_plans(self, **kwargs):
+            return []
+
+        def list_outcomes(self, **kwargs):
+            return []
+
+        def list_posts(self, **kwargs):
+            return []
+
+        def get_post_by_slug(self, slug):
+            return None
+
+        def insert_post(self, post):
+            return post
+
+        def delete_post(self, slug, pseudonym):
+            return False

app/services/community/element_snapshot.py

@@ -0,0 +1,127 @@
+# app/services/community/element_snapshot.py
+# MIT License
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+# Ingredient name substrings → allergen flag
+_ALLERGEN_MAP: dict[str, str] = {
+    "milk": "dairy", "cream": "dairy", "cheese": "dairy", "butter": "dairy",
+    "yogurt": "dairy", "whey": "dairy",
+    "egg": "eggs",
+    "wheat": "gluten", "pasta": "gluten", "flour": "gluten", "bread": "gluten",
+    "barley": "gluten", "rye": "gluten",
+    "peanut": "nuts", "almond": "nuts", "cashew": "nuts", "walnut": "nuts",
+    "pecan": "nuts", "hazelnut": "nuts", "pistachio": "nuts", "macadamia": "nuts",
+    "soy": "soy", "tofu": "soy", "edamame": "soy", "miso": "soy", "tempeh": "soy",
+    "shrimp": "shellfish", "crab": "shellfish", "lobster": "shellfish",
+    "clam": "shellfish", "mussel": "shellfish", "scallop": "shellfish",
+    "fish": "fish", "salmon": "fish", "tuna": "fish", "cod": "fish",
+    "tilapia": "fish", "halibut": "fish",
+    "sesame": "sesame",
+}
+
+_MEAT_KEYWORDS = frozenset([
+    "chicken", "beef", "pork", "lamb", "turkey", "bacon", "ham", "sausage",
+    "salami", "prosciutto", "guanciale", "pancetta", "steak", "ground meat",
+    "mince", "veal", "duck", "venison", "bison", "lard",
+])
+_SEAFOOD_KEYWORDS = frozenset([
+    "fish", "shrimp", "crab", "lobster", "tuna", "salmon", "clam", "mussel",
+    "scallop", "anchovy", "sardine", "cod", "tilapia",
+])
+_ANIMAL_PRODUCT_KEYWORDS = frozenset([
+    "milk", "cream", "cheese", "butter", "egg", "honey", "yogurt", "whey",
+])
+
+
+def _detect_allergens(ingredient_names: list[str]) -> list[str]:
+    found: set[str] = set()
+    for ingredient in (n.lower() for n in ingredient_names):
+        for keyword, flag in _ALLERGEN_MAP.items():
+            if keyword in ingredient:
+                found.add(flag)
+    return sorted(found)
+
+
+def _detect_dietary_tags(ingredient_names: list[str]) -> list[str]:
+    all_text = " ".join(n.lower() for n in ingredient_names)
+    has_meat = any(k in all_text for k in _MEAT_KEYWORDS)
+    has_seafood = any(k in all_text for k in _SEAFOOD_KEYWORDS)
+    has_animal_products = any(k in all_text for k in _ANIMAL_PRODUCT_KEYWORDS)
+
+    tags: list[str] = []
+    if not has_meat and not has_seafood:
+        tags.append("vegetarian")
+    if not has_meat and not has_seafood and not has_animal_products:
+        tags.append("vegan")
+    return tags
+
+
+@dataclass(frozen=True)
+class ElementSnapshot:
+    seasoning_score: float
+    richness_score: float
+    brightness_score: float
+    depth_score: float
+    aroma_score: float
+    structure_score: float
+    texture_profile: str
+    dietary_tags: tuple
+    allergen_flags: tuple
+    flavor_molecules: tuple
+    fat_pct: float | None
+    protein_pct: float | None
+    moisture_pct: float | None
+
+
+def compute_snapshot(recipe_ids: list[int], store) -> ElementSnapshot:
+    """Compute an element snapshot from a list of recipe IDs.
+
+    Pulls SFAH scores, ingredient lists, and USDA FDC macros from the corpus.
+    Averages numeric scores across all recipes. Unions allergen flags and dietary tags.
+    Call at publish time only — snapshot is stored denormalized in community_posts.
+    """
+    _empty = ElementSnapshot(
+        seasoning_score=0.0, richness_score=0.0, brightness_score=0.0,
+        depth_score=0.0, aroma_score=0.0, structure_score=0.0,
+        texture_profile="", dietary_tags=(), allergen_flags=(),
+        flavor_molecules=(), fat_pct=None, protein_pct=None, moisture_pct=None,
+    )
+    if not recipe_ids:
+        return _empty
+
+    rows = store.get_recipes_by_ids(recipe_ids)
+    if not rows:
+        return _empty
+
+    def _avg(field: str) -> float:
+        vals = [r.get(field) or 0.0 for r in rows]
+        return sum(vals) / len(vals)
+
+    all_ingredients: list[str] = []
+    for r in rows:
+        names = r.get("ingredient_names") or []
+        if isinstance(names, list):
+            all_ingredients.extend(names)
+
+    fat_vals = [r["fat"] for r in rows if r.get("fat") is not None]
+    prot_vals = [r["protein"] for r in rows if r.get("protein") is not None]
+    moist_vals = [r["moisture"] for r in rows if r.get("moisture") is not None]
+
+    return ElementSnapshot(
+        seasoning_score=_avg("seasoning_score"),
+        richness_score=_avg("richness_score"),
+        brightness_score=_avg("brightness_score"),
+        depth_score=_avg("depth_score"),
+        aroma_score=_avg("aroma_score"),
+        structure_score=_avg("structure_score"),
+        texture_profile=rows[0].get("texture_profile") or "",
+        dietary_tags=tuple(_detect_dietary_tags(all_ingredients)),
+        allergen_flags=tuple(_detect_allergens(all_ingredients)),
+        flavor_molecules=(),  # deferred — FlavorGraph ticket
+        fat_pct=(sum(fat_vals) / len(fat_vals)) if fat_vals else None,
+        protein_pct=(sum(prot_vals) / len(prot_vals)) if prot_vals else None,
+        moisture_pct=(sum(moist_vals) / len(moist_vals)) if moist_vals else None,
+    )

app/services/community/feed.py

@@ -0,0 +1,43 @@
+# app/services/community/feed.py
+# MIT License
+
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from email.utils import format_datetime
+from xml.etree.ElementTree import Element, SubElement, tostring
+
+
+def posts_to_rss(posts: list[dict], base_url: str) -> str:
+    """Generate an RSS 2.0 feed from a list of community post dicts.
+
+    base_url: the root URL of this Kiwi instance (no trailing slash).
+    Returns UTF-8 XML string.
+    """
+    rss = Element("rss", version="2.0")
+    channel = SubElement(rss, "channel")
+
+    _sub(channel, "title", "Kiwi Community Feed")
+    _sub(channel, "link", f"{base_url}/community")
+    _sub(channel, "description", "Meal plans and recipe outcomes from the Kiwi community")
+    _sub(channel, "language", "en")
+    _sub(channel, "lastBuildDate", format_datetime(datetime.now(timezone.utc)))
+
+    for post in posts:
+        item = SubElement(channel, "item")
+        _sub(item, "title", post.get("title") or "Untitled")
+        _sub(item, "link", f"{base_url}/api/v1/community/posts/{post['slug']}")
+        _sub(item, "guid", f"{base_url}/api/v1/community/posts/{post['slug']}")
+        if post.get("description"):
+            _sub(item, "description", post["description"])
+        published = post.get("published")
+        if isinstance(published, datetime):
+            _sub(item, "pubDate", format_datetime(published))
+
+    return '<?xml version="1.0" encoding="UTF-8"?>\n' + tostring(rss, encoding="unicode")
+
+
+def _sub(parent: Element, tag: str, text: str) -> Element:
+    el = SubElement(parent, tag)
+    el.text = text
+    return el

app/services/community/mdns.py

@@ -0,0 +1,111 @@
+# app/services/community/mdns.py
+# MIT License
+# mDNS advertisement for Kiwi instances on the local network.
+# Advertises _kiwi._tcp.local so other Kiwi instances (and discovery apps)
+# can find this one without manual configuration.
+#
+# Opt-in only: enabled=False by default. Users are prompted on first community
+# tab access. Never advertised without explicit consent (a11y requirement).
+
+from __future__ import annotations
+
+import logging
+import socket
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+# Deferred import — avoid hard failure when zeroconf is not installed.
+try:
+    from zeroconf import ServiceInfo, Zeroconf
+    _ZEROCONF_AVAILABLE = True
+except ImportError:  # pragma: no cover
+    _ZEROCONF_AVAILABLE = False
+
+
+class KiwiMDNS:
+    """Context manager that advertises this Kiwi instance via mDNS (_kiwi._tcp.local).
+
+    Defaults to disabled. User must explicitly opt in via Settings.
+    feed_url is broadcast in the TXT record so peer instances know where to fetch posts.
+
+    Usage:
+        mdns = KiwiMDNS(
+            enabled=settings.MDNS_ENABLED,
+            port=8512,
+            feed_url="http://10.0.0.5:8512/api/v1/community/local-feed",
+        )
+        mdns.start()   # in lifespan startup
+        mdns.stop()    # in lifespan shutdown
+    """
+
+    SERVICE_TYPE = "_kiwi._tcp.local."
+
+    def __init__(
+        self,
+        port: int = 8512,
+        name: str | None = None,
+        feed_url: str = "",
+        enabled: bool = False,
+    ) -> None:
+        self._port = port
+        self._name = name or f"kiwi-{socket.gethostname()}"
+        self._feed_url = feed_url
+        self._enabled = enabled
+        self._zc: Any = None
+        self._info: Any = None
+
+    def start(self) -> None:
+        if not self._enabled:
+            logger.info("mDNS advertisement disabled (user opt-in required)")
+            return
+        try:
+            local_ip = _get_local_ip()
+            props = {b"product": b"kiwi", b"version": b"1"}
+            if self._feed_url:
+                props[b"feed"] = self._feed_url.encode()
+
+            self._info = ServiceInfo(
+                type_=self.SERVICE_TYPE,
+                name=f"{self._name}.{self.SERVICE_TYPE}",
+                addresses=[socket.inet_aton(local_ip)],
+                port=self._port,
+                properties=props,
+                server=f"{socket.gethostname()}.local.",
+            )
+            self._zc = Zeroconf()
+            self._zc.register_service(self._info)
+            logger.info("mDNS: advertising %s on %s:%d", self._name, local_ip, self._port)
+        except Exception as exc:
+            logger.warning("mDNS advertisement failed (non-fatal): %s", exc)
+            self._zc = None
+            self._info = None
+
+    def stop(self) -> None:
+        if self._zc and self._info:
+            try:
+                self._zc.unregister_service(self._info)
+                self._zc.close()
+                logger.info("mDNS: unregistered %s", self._name)
+            except Exception as exc:
+                logger.warning("mDNS unregister failed (non-fatal): %s", exc)
+            finally:
+                self._zc = None
+                self._info = None
+
+    def __enter__(self) -> "KiwiMDNS":
+        self.start()
+        return self
+
+    def __exit__(self, *_: object) -> None:
+        self.stop()
+
+
+def _get_local_ip() -> str:
+    """Return the primary non-loopback IPv4 address of this host."""
+    try:
+        with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
+            s.connect(("8.8.8.8", 80))
+            return s.getsockname()[0]
+    except OSError:
+        return "127.0.0.1"

app/tiers.py

@@ -18,6 +18,7 @@ KIWI_BYOK_UNLOCKABLE: frozenset[str] = frozenset({
     "style_classifier",
     "meal_plan_llm",
     "meal_plan_llm_timing",
+    "community_fork_adapt",   # Fork a community plan with LLM pantry adaptation
 })
 
 # Feature → minimum tier required
@@ -44,6 +45,11 @@ KIWI_FEATURES: dict[str, str] = {
     "recipe_collections":    "paid",
     "style_classifier":      "paid",   # LLM auto-tag for saved recipe style tags; BYOK-unlockable
 
+    # Community (free to browse, paid to publish/fork)
+    "community_browse":      "free",    # Read-only feed access
+    "community_publish":     "paid",    # Publish plans/outcomes to community feed
+    "community_fork_adapt":  "paid",    # Fork a plan with LLM pantry adaptation; BYOK-unlockable
+
     # Premium tier
     "multi_household":       "premium",
     "background_monitoring": "premium",

frontend/src/components/CommunityFeedPanel.vue

@@ -0,0 +1,231 @@
+<!-- frontend/src/components/CommunityFeedPanel.vue -->
+<template>
+  <div class="community-feed-panel">
+    <!-- Filter bar -->
+    <div class="filter-bar" role="toolbar" aria-label="Filter community posts">
+      <button
+        v-for="f in FILTERS"
+        :key="f.value ?? 'all'"
+        class="filter-btn"
+        :class="{ active: activeFilter === f.value }"
+        :aria-pressed="activeFilter === f.value"
+        @click="setFilter(f.value)"
+      >{{ f.label }}</button>
+    </div>
+
+    <!-- Results count (aria-live so screen readers announce changes) -->
+    <p
+      class="results-summary"
+      aria-live="polite"
+      aria-atomic="true"
+    >
+      <template v-if="!loading">
+        {{ posts.length }} post{{ posts.length !== 1 ? 's' : '' }}
+        <template v-if="activeFilter"> · {{ activeFilterLabel }}</template>
+      </template>
+    </p>
+
+    <!-- Publish button (visible when plan is active) -->
+    <div class="publish-row" v-if="activePlanId">
+      <button class="publish-btn" @click="showPublish = true">
+        Share this week's plan
+      </button>
+    </div>
+
+    <!-- Error state -->
+    <div v-if="error" class="feed-error" role="alert">
+      <p>{{ error }}</p>
+      <button class="retry-btn" @click="communityStore.clearError(); communityStore.loadPosts(true)">
+        Try again
+      </button>
+    </div>
+
+    <!-- Feed -->
+    <div v-else-if="posts.length" class="feed-list">
+      <CommunityPostCard
+        v-for="post in posts"
+        :key="post.slug"
+        :post="post"
+        :forking="forkingSlug === post.slug"
+        @fork="onFork"
+      />
+
+      <button
+        v-if="hasMore && !loading"
+        class="load-more-btn"
+        @click="communityStore.loadPosts()"
+      >
+        Load more
+      </button>
+    </div>
+
+    <!-- Loading skeleton -->
+    <div v-else-if="loading" class="feed-loading" aria-busy="true" aria-label="Loading posts">
+      <div v-for="i in 3" :key="i" class="skeleton-card"></div>
+    </div>
+
+    <!-- Empty state -->
+    <div v-else-if="isEmpty" class="feed-empty">
+      <p>No community posts yet.</p>
+      <p class="feed-empty-hint">Be the first to share a meal plan!</p>
+    </div>
+
+    <!-- Fork success toast -->
+    <div
+      v-if="forkSuccess"
+      class="fork-toast"
+      role="status"
+      aria-live="polite"
+    >
+      Plan forked into your week starting {{ forkSuccess.week_start }}
+    </div>
+
+    <!-- Publish modal -->
+    <PublishPlanModal
+      v-if="showPublish"
+      :plan-id="activePlanId"
+      @close="showPublish = false"
+      @published="onPublished"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, onMounted } from 'vue'
+import { storeToRefs } from 'pinia'
+import { useCommunityStore } from '../stores/community'
+import CommunityPostCard from './CommunityPostCard.vue'
+import PublishPlanModal from './PublishPlanModal.vue'
+
+const props = defineProps<{
+  activePlanId?: number | null
+}>()
+
+const communityStore = useCommunityStore()
+const { posts, loading, error, hasMore, isEmpty } = storeToRefs(communityStore)
+
+const activeFilter = ref<'plan' | 'recipe_success' | 'recipe_blooper' | null>(null)
+const showPublish = ref(false)
+const forkingSlug = ref<string | null>(null)
+const forkSuccess = ref<{ plan_id: number; week_start: string } | null>(null)
+
+const FILTERS = [
+  { label: 'All',      value: null },
+  { label: 'Plans',    value: 'plan' as const },
+  { label: 'Wins',     value: 'recipe_success' as const },
+  { label: 'Bloopers', value: 'recipe_blooper' as const },
+] as const
+
+const activeFilterLabel = computed(
+  () => FILTERS.find(f => f.value === activeFilter.value)?.label ?? ''
+)
+
+onMounted(() => communityStore.loadPosts(true))
+
+function setFilter(value: typeof activeFilter.value) {
+  activeFilter.value = value
+  communityStore.setFilter(value)
+}
+
+async function onFork(slug: string) {
+  forkingSlug.value = slug
+  forkSuccess.value = null
+  const result = await communityStore.forkPost(slug)
+  forkingSlug.value = null
+  if (result) {
+    forkSuccess.value = result
+    setTimeout(() => { forkSuccess.value = null }, 4000)
+  }
+}
+
+function onPublished() {
+  showPublish.value = false
+  communityStore.loadPosts(true)
+}
+</script>
+
+<style scoped>
+.community-feed-panel { display: flex; flex-direction: column; gap: 0.75rem; }
+
+.filter-bar { display: flex; gap: 6px; flex-wrap: wrap; }
+.filter-btn {
+  font-size: 0.78rem;
+  padding: 0.25rem 0.75rem;
+  border-radius: 16px;
+  border: 1px solid var(--color-border);
+  background: var(--color-surface);
+  color: var(--color-text-secondary);
+  cursor: pointer;
+  transition: background 0.15s, color 0.15s, border-color 0.15s;
+}
+.filter-btn.active, .filter-btn:hover {
+  background: var(--color-accent-subtle);
+  color: var(--color-accent);
+  border-color: var(--color-accent);
+}
+.filter-btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
+
+.results-summary { font-size: 0.75rem; color: var(--color-text-secondary); min-height: 1.1em; margin: 0; }
+
+.publish-row { display: flex; }
+.publish-btn {
+  font-size: 0.82rem;
+  padding: 0.4rem 1.1rem;
+  border-radius: 20px;
+  background: var(--color-accent);
+  color: white;
+  border: none;
+  cursor: pointer;
+  transition: opacity 0.15s;
+}
+.publish-btn:hover { opacity: 0.88; }
+.publish-btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
+
+.feed-list { display: flex; flex-direction: column; gap: 0.75rem; }
+
+.load-more-btn {
+  align-self: center;
+  font-size: 0.8rem;
+  padding: 0.4rem 1.2rem;
+  border-radius: 16px;
+  border: 1px solid var(--color-border);
+  background: var(--color-surface);
+  color: var(--color-text-secondary);
+  cursor: pointer;
+}
+.load-more-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
+
+.feed-loading { display: flex; flex-direction: column; gap: 0.75rem; }
+.skeleton-card {
+  height: 110px;
+  border-radius: 10px;
+  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border) 50%, var(--color-surface) 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.4s infinite;
+}
+@media (prefers-reduced-motion: reduce) { .skeleton-card { animation: none; background: var(--color-surface); } }
+@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
+
+.feed-empty { text-align: center; padding: 2rem 0; color: var(--color-text-secondary); }
+.feed-empty p { margin: 0.25rem 0; }
+.feed-empty-hint { font-size: 0.82rem; opacity: 0.7; }
+
+.feed-error { padding: 0.75rem 1rem; border-radius: 8px; background: color-mix(in srgb, red 8%, transparent); border: 1px solid color-mix(in srgb, red 20%, transparent); }
+.feed-error p { margin: 0 0 0.5rem; font-size: 0.85rem; color: var(--color-text); }
+.retry-btn { font-size: 0.78rem; padding: 0.3rem 0.8rem; border-radius: 14px; border: 1px solid currentColor; background: none; cursor: pointer; color: var(--color-accent); }
+
+.fork-toast {
+  position: fixed;
+  bottom: 1.5rem;
+  left: 50%;
+  transform: translateX(-50%);
+  background: var(--color-accent);
+  color: white;
+  padding: 0.6rem 1.2rem;
+  border-radius: 20px;
+  font-size: 0.85rem;
+  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
+  z-index: 100;
+  pointer-events: none;
+}
+</style>

frontend/src/components/CommunityPostCard.vue

@@ -0,0 +1,171 @@
+<!-- frontend/src/components/CommunityPostCard.vue -->
+<template>
+  <article class="post-card" :class="`post-type-${post.post_type}`">
+    <header class="post-header">
+      <span class="post-type-badge" :aria-label="`Post type: ${typeLabel}`">{{ typeLabel }}</span>
+      <time class="post-date" :datetime="post.published">{{ formattedDate }}</time>
+    </header>
+
+    <h3 class="post-title">{{ post.title }}</h3>
+
+    <p v-if="post.description" class="post-description">{{ post.description }}</p>
+
+    <div v-if="post.dietary_tags.length || post.allergen_flags.length" class="post-tags">
+      <span
+        v-for="tag in post.dietary_tags"
+        :key="tag"
+        class="tag tag-dietary"
+        :aria-label="`Dietary: ${tag}`"
+      >{{ tag }}</span>
+      <span
+        v-for="flag in post.allergen_flags"
+        :key="flag"
+        class="tag tag-allergen"
+        :aria-label="`Contains: ${flag}`"
+      >{{ flag }}</span>
+    </div>
+
+    <div v-if="post.post_type === 'plan' && post.slots.length" class="post-slots">
+      <span class="slots-summary">
+        {{ post.slots.length }} meal{{ post.slots.length !== 1 ? 's' : '' }} planned
+      </span>
+    </div>
+
+    <div v-if="post.outcome_notes" class="outcome-notes">
+      <p class="outcome-label">Notes</p>
+      <p class="outcome-text">{{ post.outcome_notes }}</p>
+    </div>
+
+    <footer class="post-footer">
+      <span class="post-author">by {{ post.pseudonym }}</span>
+
+      <div class="post-actions">
+        <button
+          v-if="post.post_type === 'plan'"
+          class="action-btn fork-btn"
+          :disabled="forking"
+          :aria-busy="forking"
+          @click="$emit('fork', post.slug)"
+        >
+          {{ forking ? 'Forking…' : 'Fork plan' }}
+        </button>
+      </div>
+    </footer>
+  </article>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+import type { CommunityPost } from '../stores/community'
+
+const props = defineProps<{
+  post: CommunityPost
+  forking?: boolean
+}>()
+
+defineEmits<{
+  fork: [slug: string]
+}>()
+
+const typeLabel = computed(() => ({
+  plan: 'Meal Plan',
+  recipe_success: 'Recipe Win',
+  recipe_blooper: 'Recipe Blooper',
+}[props.post.post_type] ?? props.post.post_type))
+
+const formattedDate = computed(() => {
+  try {
+    return new Date(props.post.published).toLocaleDateString(undefined, {
+      year: 'numeric', month: 'short', day: 'numeric',
+    })
+  } catch {
+    return props.post.published
+  }
+})
+</script>
+
+<style scoped>
+.post-card {
+  background: var(--color-surface);
+  border: 1px solid var(--color-border);
+  border-radius: 10px;
+  padding: 0.9rem 1rem;
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+  transition: box-shadow 0.15s;
+}
+.post-card:hover { box-shadow: 0 2px 8px color-mix(in srgb, var(--color-accent) 12%, transparent); }
+
+.post-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 0.5rem;
+}
+.post-type-badge {
+  font-size: 0.7rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+  padding: 0.15rem 0.5rem;
+  border-radius: 20px;
+  background: var(--color-accent-subtle);
+  color: var(--color-accent);
+}
+.post-type-recipe_blooper .post-type-badge { background: color-mix(in srgb, orange 15%, transparent); color: #b36000; }
+.post-type-recipe_success .post-type-badge { background: color-mix(in srgb, green 12%, transparent); color: #2a7a2a; }
+
+.post-date { font-size: 0.75rem; color: var(--color-text-secondary); }
+
+.post-title {
+  margin: 0;
+  font-size: 0.95rem;
+  font-weight: 600;
+  color: var(--color-text);
+  line-height: 1.3;
+}
+
+.post-description { margin: 0; font-size: 0.82rem; color: var(--color-text-secondary); line-height: 1.5; }
+
+.post-tags { display: flex; flex-wrap: wrap; gap: 4px; }
+.tag {
+  font-size: 0.68rem;
+  padding: 0.1rem 0.4rem;
+  border-radius: 10px;
+  border: 1px solid var(--color-border);
+  color: var(--color-text-secondary);
+}
+.tag-dietary { border-color: color-mix(in srgb, green 30%, transparent); color: #2a7a2a; }
+.tag-allergen { border-color: color-mix(in srgb, orange 30%, transparent); color: #b36000; }
+
+.slots-summary { font-size: 0.78rem; color: var(--color-text-secondary); }
+
+.outcome-notes { background: var(--color-bg); border-radius: 6px; padding: 0.5rem 0.7rem; }
+.outcome-label { margin: 0 0 0.2rem; font-size: 0.7rem; font-weight: 600; text-transform: uppercase; color: var(--color-text-secondary); }
+.outcome-text { margin: 0; font-size: 0.82rem; color: var(--color-text); line-height: 1.5; }
+
+.post-footer {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-top: 0.25rem;
+  flex-wrap: wrap;
+  gap: 0.4rem;
+}
+.post-author { font-size: 0.75rem; color: var(--color-text-secondary); font-style: italic; }
+
+.action-btn {
+  font-size: 0.78rem;
+  padding: 0.3rem 0.8rem;
+  border-radius: 16px;
+  border: 1px solid var(--color-accent);
+  background: var(--color-accent-subtle);
+  color: var(--color-accent);
+  cursor: pointer;
+  transition: background 0.15s;
+}
+.action-btn:hover:not(:disabled) { background: var(--color-accent); color: white; }
+.action-btn:disabled { opacity: 0.5; cursor: default; }
+.action-btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
+</style>

frontend/src/components/MealPlanView.vue

@@ -26,7 +26,7 @@
         @add-meal-type="onAddMealType"
       />
 
-      <!-- Panel tabs: Shopping List | Prep Schedule -->
+      <!-- Panel tabs: Shopping List | Prep Schedule | Community -->
       <div class="panel-tabs" role="tablist" aria-label="Plan outputs">
         <button
           v-for="tab in TABS"
@@ -60,6 +60,16 @@
       >
         <PrepSessionView @load="store.loadPrepSession()" />
       </div>
+
+      <div
+        v-show="activeTab === 'community'"
+        id="tabpanel-community"
+        role="tabpanel"
+        aria-labelledby="tab-community"
+        class="tab-panel"
+      >
+        <CommunityFeedPanel :active-plan-id="activePlan?.id ?? null" />
+      </div>
     </template>
 
     <div v-else-if="!loading" class="empty-plan-state">
@@ -76,10 +86,12 @@ import { useMealPlanStore } from '../stores/mealPlan'
 import MealPlanGrid from './MealPlanGrid.vue'
 import ShoppingListPanel from './ShoppingListPanel.vue'
 import PrepSessionView from './PrepSessionView.vue'
+import CommunityFeedPanel from './CommunityFeedPanel.vue'
 
 const TABS = [
   { id: 'shopping',  label: 'Shopping List' },
   { id: 'prep',      label: 'Prep Schedule' },
+  { id: 'community', label: 'Community' },
 ] as const
 
 type TabId = typeof TABS[number]['id']

frontend/src/components/PublishPlanModal.vue

@@ -0,0 +1,230 @@
+<!-- frontend/src/components/PublishPlanModal.vue -->
+<!-- Publish a meal plan to the community feed.
+     Pseudonym setup is inline (pre-populated, feels like invitation).
+     Focus-trapped per a11y audit. No countdown on delete-undo. -->
+<template>
+  <div
+    class="modal-backdrop"
+    role="dialog"
+    aria-modal="true"
+    aria-labelledby="publish-modal-title"
+    @keydown.esc="$emit('close')"
+    ref="backdropEl"
+    @click.self="$emit('close')"
+  >
+    <div class="modal-card" ref="cardEl">
+      <header class="modal-header">
+        <h2 id="publish-modal-title" class="modal-title">Share this week's plan</h2>
+        <button class="close-btn" aria-label="Close" @click="$emit('close')">×</button>
+      </header>
+
+      <div class="modal-body">
+        <div class="field">
+          <label for="plan-title" class="field-label">Title</label>
+          <input
+            id="plan-title"
+            v-model="title"
+            class="field-input"
+            type="text"
+            placeholder="e.g. Pasta Week"
+            maxlength="120"
+            required
+            ref="firstFocusEl"
+          />
+        </div>
+
+        <div class="field">
+          <label for="plan-description" class="field-label">Description <span class="optional">(optional)</span></label>
+          <textarea
+            id="plan-description"
+            v-model="description"
+            class="field-input field-textarea"
+            placeholder="What makes this week special?"
+            maxlength="400"
+            rows="3"
+          />
+        </div>
+
+        <div class="field">
+          <label for="pseudonym" class="field-label">
+            Your community name
+            <span class="field-hint">How you appear on posts — not your real name or email</span>
+          </label>
+          <input
+            id="pseudonym"
+            v-model="pseudonymName"
+            class="field-input"
+            type="text"
+            placeholder="e.g. PastaWitch"
+            maxlength="40"
+          />
+          <p v-if="pseudonymError" class="field-error" role="alert">{{ pseudonymError }}</p>
+        </div>
+
+        <p v-if="error" class="submit-error" role="alert">{{ error }}</p>
+      </div>
+
+      <footer class="modal-footer">
+        <button class="cancel-btn" @click="$emit('close')">Cancel</button>
+        <button
+          class="publish-btn"
+          :disabled="submitting || !title.trim()"
+          :aria-busy="submitting"
+          @click="onSubmit"
+        >
+          {{ submitting ? 'Publishing…' : 'Publish' }}
+        </button>
+      </footer>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted, onBeforeUnmount } from 'vue'
+import { useCommunityStore } from '../stores/community'
+
+const props = defineProps<{
+  planId?: number | null
+}>()
+
+const emit = defineEmits<{
+  close: []
+  published: []
+}>()
+
+const communityStore = useCommunityStore()
+
+const title = ref('')
+const description = ref('')
+const pseudonymName = ref('')
+const pseudonymError = ref('')
+const submitting = ref(false)
+const error = ref('')
+
+const backdropEl = ref<HTMLElement | null>(null)
+const cardEl = ref<HTMLElement | null>(null)
+const firstFocusEl = ref<HTMLInputElement | null>(null)
+
+onMounted(() => {
+  firstFocusEl.value?.focus()
+  document.addEventListener('keydown', trapFocus)
+})
+
+onBeforeUnmount(() => {
+  document.removeEventListener('keydown', trapFocus)
+})
+
+function trapFocus(e: KeyboardEvent) {
+  if (e.key !== 'Tab' || !cardEl.value) return
+  const focusables = cardEl.value.querySelectorAll<HTMLElement>(
+    'button, input, textarea, [tabindex]:not([tabindex="-1"])'
+  )
+  const first = focusables[0]
+  const last = focusables[focusables.length - 1]
+  if (e.shiftKey) {
+    if (document.activeElement === first) { e.preventDefault(); last.focus() }
+  } else {
+    if (document.activeElement === last) { e.preventDefault(); first.focus() }
+  }
+}
+
+async function onSubmit() {
+  pseudonymError.value = ''
+  error.value = ''
+
+  if (pseudonymName.value && pseudonymName.value.includes('@')) {
+    pseudonymError.value = 'Community name must not contain "@" — use a display name, not an email.'
+    return
+  }
+
+  submitting.value = true
+  const result = await communityStore.publishPost({
+    post_type: 'plan',
+    title: title.value.trim(),
+    description: description.value.trim() || undefined,
+    pseudonym_name: pseudonymName.value.trim() || undefined,
+  })
+  submitting.value = false
+
+  if (result) {
+    emit('published')
+  } else {
+    error.value = communityStore.error ?? 'Publish failed. Please try again.'
+  }
+}
+</script>
+
+<style scoped>
+.modal-backdrop {
+  position: fixed; inset: 0; background: rgba(0,0,0,0.45); z-index: 200;
+  display: flex; align-items: center; justify-content: center; padding: 1rem;
+}
+
+.modal-card {
+  background: var(--color-surface);
+  border: 1px solid var(--color-border);
+  border-radius: 14px;
+  width: 100%;
+  max-width: 440px;
+  max-height: 90vh;
+  overflow-y: auto;
+  display: flex;
+  flex-direction: column;
+  box-shadow: 0 8px 32px rgba(0,0,0,0.22);
+}
+
+.modal-header {
+  display: flex; justify-content: space-between; align-items: center;
+  padding: 1rem 1.2rem 0.75rem;
+  border-bottom: 1px solid var(--color-border);
+}
+.modal-title { margin: 0; font-size: 1rem; font-weight: 600; }
+.close-btn {
+  background: none; border: none; font-size: 1.4rem; cursor: pointer;
+  color: var(--color-text-secondary); line-height: 1; padding: 0 0.2rem;
+}
+.close-btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
+
+.modal-body { padding: 1rem 1.2rem; display: flex; flex-direction: column; gap: 0.9rem; }
+
+.field { display: flex; flex-direction: column; gap: 0.3rem; }
+.field-label { font-size: 0.82rem; font-weight: 600; color: var(--color-text); }
+.optional { font-weight: 400; color: var(--color-text-secondary); }
+.field-hint { display: block; font-size: 0.72rem; color: var(--color-text-secondary); font-weight: 400; margin-top: 0.1rem; }
+.field-input {
+  padding: 0.45rem 0.65rem;
+  border: 1px solid var(--color-border);
+  border-radius: 7px;
+  background: var(--color-bg);
+  color: var(--color-text);
+  font-size: 0.88rem;
+  width: 100%;
+  box-sizing: border-box;
+}
+.field-input:focus { outline: 2px solid var(--color-accent); border-color: transparent; }
+.field-textarea { resize: vertical; font-family: inherit; min-height: 70px; }
+.field-error { margin: 0; font-size: 0.78rem; color: #c0392b; }
+
+.submit-error { margin: 0; font-size: 0.82rem; color: #c0392b; }
+
+.modal-footer {
+  padding: 0.85rem 1.2rem;
+  border-top: 1px solid var(--color-border);
+  display: flex;
+  gap: 0.6rem;
+  justify-content: flex-end;
+}
+.cancel-btn {
+  padding: 0.4rem 1rem; border-radius: 8px; border: 1px solid var(--color-border);
+  background: none; color: var(--color-text-secondary); cursor: pointer; font-size: 0.85rem;
+}
+.cancel-btn:hover { border-color: var(--color-text-secondary); }
+.publish-btn {
+  padding: 0.4rem 1.2rem; border-radius: 8px; border: none;
+  background: var(--color-accent); color: white; cursor: pointer; font-size: 0.85rem;
+  font-weight: 600;
+}
+.publish-btn:hover:not(:disabled) { opacity: 0.88; }
+.publish-btn:disabled { opacity: 0.5; cursor: default; }
+.publish-btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
+</style>

frontend/src/stores/community.ts

@@ -0,0 +1,123 @@
+// frontend/src/stores/community.ts
+import { ref, computed } from 'vue'
+import { defineStore } from 'pinia'
+import { api } from '../services/api'
+
+export interface CommunityPost {
+  slug: string
+  pseudonym: string
+  post_type: 'plan' | 'recipe_success' | 'recipe_blooper'
+  published: string
+  title: string
+  description: string | null
+  photo_url: string | null
+  slots: Array<{ day: string; meal_type: string; recipe_id: number; recipe_name: string }>
+  recipe_id: number | null
+  recipe_name: string | null
+  level: number | null
+  outcome_notes: string | null
+  element_profiles: {
+    seasoning_score: number
+    richness_score: number
+    brightness_score: number
+    depth_score: number
+    aroma_score: number
+    structure_score: number
+    texture_profile: string
+  }
+  dietary_tags: string[]
+  allergen_flags: string[]
+  fat_pct: number | null
+  protein_pct: number | null
+  moisture_pct: number | null
+}
+
+export const useCommunityStore = defineStore('community', () => {
+  const posts = ref<CommunityPost[]>([])
+  const loading = ref(false)
+  const error = ref<string | null>(null)
+  const page = ref(1)
+  const hasMore = ref(true)
+  const pseudonym = ref<string | null>(null)
+
+  // Filters
+  const filterDietaryTags = ref<string[]>([])
+  const filterPostType = ref<'plan' | 'recipe_success' | 'recipe_blooper' | null>(null)
+
+  const isEmpty = computed(() => !loading.value && posts.value.length === 0)
+
+  async function loadPosts(reset = false) {
+    if (loading.value) return
+    if (reset) {
+      posts.value = []
+      page.value = 1
+      hasMore.value = true
+    }
+    if (!hasMore.value) return
+
+    loading.value = true
+    error.value = null
+    try {
+      const params: Record<string, string | number> = {
+        page: page.value,
+        page_size: 20,
+      }
+      if (filterPostType.value) params.post_type = filterPostType.value
+      if (filterDietaryTags.value.length) params.dietary_tags = filterDietaryTags.value.join(',')
+
+      const res = await api.get('/community/posts', { params })
+      const newPosts: CommunityPost[] = res.data.posts ?? []
+      posts.value = reset ? newPosts : [...posts.value, ...newPosts]
+      hasMore.value = newPosts.length === 20
+      page.value += 1
+    } catch (err: any) {
+      error.value = err?.response?.data?.detail ?? 'Could not load community posts.'
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function forkPost(slug: string): Promise<{ plan_id: number; week_start: string } | null> {
+    try {
+      const res = await api.post(`/community/posts/${slug}/fork`)
+      return res.data
+    } catch (err: any) {
+      error.value = err?.response?.data?.detail ?? 'Fork failed.'
+      return null
+    }
+  }
+
+  async function publishPost(payload: {
+    post_type: string
+    title: string
+    description?: string
+    pseudonym_name?: string
+    slots?: unknown[]
+    recipe_id?: number
+    recipe_name?: string
+    outcome_notes?: string
+  }): Promise<CommunityPost | null> {
+    try {
+      const res = await api.post('/community/posts', payload)
+      return res.data
+    } catch (err: any) {
+      error.value = err?.response?.data?.detail ?? 'Publish failed.'
+      return null
+    }
+  }
+
+  function setFilter(type: typeof filterPostType.value) {
+    filterPostType.value = type
+    loadPosts(true)
+  }
+
+  function clearError() {
+    error.value = null
+  }
+
+  return {
+    posts, loading, error, page, hasMore, pseudonym,
+    filterDietaryTags, filterPostType, isEmpty,
+    loadPosts, forkPost, publishPost, setFilter, clearError,
+  }
+})

pyproject.toml

@@ -24,6 +24,8 @@ dependencies = [
     "requests>=2.31",
     # CircuitForge shared scaffold
     "circuitforge-core>=0.8.0",
+    # mDNS advertisement (opt-in: _kiwi._tcp.local discovery)
+    "zeroconf>=0.131",
 ]
 
 [tool.setuptools.packages.find]

tests/api/test_community_endpoints.py

@@ -0,0 +1,68 @@
+# tests/api/test_community_endpoints.py
+import pytest
+from unittest.mock import patch, MagicMock
+from fastapi.testclient import TestClient
+from app.main import app
+
+client = TestClient(app)
+
+
+def test_get_community_posts_no_db_returns_empty():
+    """When COMMUNITY_DB_URL is not set, GET /community/posts returns empty list (no 500)."""
+    with patch("app.api.endpoints.community._community_store", None):
+        response = client.get("/api/v1/community/posts")
+    assert response.status_code == 200
+    data = response.json()
+    assert "posts" in data
+    assert isinstance(data["posts"], list)
+
+
+def test_get_community_post_not_found():
+    """GET /community/posts/{slug} returns 404 when slug doesn't exist."""
+    mock_store = MagicMock()
+    mock_store.get_post_by_slug.return_value = None
+    with patch("app.api.endpoints.community._community_store", mock_store):
+        response = client.get("/api/v1/community/posts/nonexistent-slug")
+    assert response.status_code == 404
+
+
+def test_get_community_rss():
+    """GET /community/feed.rss returns XML content-type."""
+    with patch("app.api.endpoints.community._community_store", None):
+        response = client.get("/api/v1/community/feed.rss")
+    assert response.status_code == 200
+    assert "xml" in response.headers.get("content-type", "")
+
+
+def test_post_community_no_store_returns_503():
+    """POST /community/posts returns 503 when community DB is not configured.
+
+    In local/dev mode the session auth is bypassed (local session). The endpoint
+    should then fail-soft with 503, not 500. Production cloud mode enforces auth
+    before the store check — tested in integration tests.
+    """
+    with patch("app.api.endpoints.community._community_store", None):
+        response = client.post("/api/v1/community/posts", json={"title": "Test"})
+    # 503 = no community store; 402 = tier gate fired first; both are acceptable
+    assert response.status_code in (402, 503)
+
+
+def test_delete_post_no_store_returns_503():
+    """DELETE /community/posts/{slug} returns 503 when community DB is not configured."""
+    with patch("app.api.endpoints.community._community_store", None):
+        response = client.delete("/api/v1/community/posts/some-slug")
+    assert response.status_code in (400, 503)
+
+
+def test_fork_post_route_exists():
+    """POST /community/posts/{slug}/fork route must exist (not 404)."""
+    response = client.post("/api/v1/community/posts/some-slug/fork")
+    assert response.status_code != 404
+
+
+def test_local_feed_returns_json():
+    """GET /community/local-feed returns JSON list for LAN peers."""
+    with patch("app.api.endpoints.community._community_store", None):
+        response = client.get("/api/v1/community/local-feed")
+    assert response.status_code == 200
+    assert isinstance(response.json(), list)

tests/db/test_migration_026.py

@@ -0,0 +1,49 @@
+# tests/db/test_migration_026.py
+import pytest
+from pathlib import Path
+from app.db.store import Store
+
+
+def test_migration_026_adds_community_pseudonyms(tmp_path):
+    """Migration 026 adds community_pseudonyms table to per-user kiwi.db."""
+    store = Store(tmp_path / "test.db")
+    cur = store.conn.execute(
+        "SELECT name FROM sqlite_master WHERE type='table' AND name='community_pseudonyms'"
+    )
+    assert cur.fetchone() is not None, "community_pseudonyms table must exist after migrations"
+    store.close()
+
+
+def test_migration_026_unique_index_enforces_single_current_pseudonym(tmp_path):
+    """Only one is_current=1 pseudonym per directus_user_id is allowed."""
+    store = Store(tmp_path / "test.db")
+    store.conn.execute(
+        "INSERT INTO community_pseudonyms (pseudonym, directus_user_id, is_current) VALUES (?, ?, 1)",
+        ("PastaWitch", "user-abc-123"),
+    )
+    store.conn.commit()
+
+    import sqlite3
+    with pytest.raises(sqlite3.IntegrityError):
+        store.conn.execute(
+            "INSERT INTO community_pseudonyms (pseudonym, directus_user_id, is_current) VALUES (?, ?, 1)",
+            ("NoodleNinja", "user-abc-123"),
+        )
+        store.conn.commit()
+
+    store.close()
+
+
+def test_migration_026_allows_historical_pseudonyms(tmp_path):
+    """Multiple is_current=0 pseudonyms are allowed for the same user."""
+    store = Store(tmp_path / "test.db")
+    store.conn.executemany(
+        "INSERT INTO community_pseudonyms (pseudonym, directus_user_id, is_current) VALUES (?, ?, 0)",
+        [("OldName1", "user-abc-123"), ("OldName2", "user-abc-123")],
+    )
+    store.conn.commit()
+    cur = store.conn.execute(
+        "SELECT COUNT(*) FROM community_pseudonyms WHERE directus_user_id='user-abc-123'"
+    )
+    assert cur.fetchone()[0] == 2
+    store.close()

tests/services/community/test_ap_compat.py

@@ -0,0 +1,47 @@
+# tests/services/community/test_ap_compat.py
+import pytest
+from datetime import datetime, timezone
+from app.services.community.ap_compat import post_to_ap_json_ld
+
+
+POST = {
+    "slug": "kiwi-plan-test-pasta-week",
+    "title": "Pasta Week",
+    "description": "Seven days of carbs",
+    "published": datetime(2026, 4, 12, 12, 0, 0, tzinfo=timezone.utc),
+    "pseudonym": "PastaWitch",
+    "dietary_tags": ["vegetarian"],
+}
+
+
+def test_ap_json_ld_context():
+    doc = post_to_ap_json_ld(POST, base_url="https://menagerie.circuitforge.tech/kiwi")
+    assert doc["@context"] == "https://www.w3.org/ns/activitystreams"
+
+
+def test_ap_json_ld_type():
+    doc = post_to_ap_json_ld(POST, base_url="https://menagerie.circuitforge.tech/kiwi")
+    assert doc["type"] == "Note"
+
+
+def test_ap_json_ld_id_is_uri():
+    doc = post_to_ap_json_ld(POST, base_url="https://menagerie.circuitforge.tech/kiwi")
+    assert doc["id"].startswith("https://")
+    assert POST["slug"] in doc["id"]
+
+
+def test_ap_json_ld_published_is_iso8601():
+    doc = post_to_ap_json_ld(POST, base_url="https://menagerie.circuitforge.tech/kiwi")
+    from datetime import datetime
+    datetime.fromisoformat(doc["published"].replace("Z", "+00:00"))
+
+
+def test_ap_json_ld_attributed_to_pseudonym():
+    doc = post_to_ap_json_ld(POST, base_url="https://menagerie.circuitforge.tech/kiwi")
+    assert doc["attributedTo"] == "PastaWitch"
+
+
+def test_ap_json_ld_tags_include_kiwi():
+    doc = post_to_ap_json_ld(POST, base_url="https://menagerie.circuitforge.tech/kiwi")
+    tag_names = [t["name"] for t in doc.get("tag", [])]
+    assert "#kiwi" in tag_names

tests/services/community/test_community_store.py

@@ -0,0 +1,64 @@
+# tests/services/community/test_community_store.py
+import pytest
+from unittest.mock import MagicMock, patch
+from app.services.community.community_store import KiwiCommunityStore, get_or_create_pseudonym
+
+
+def test_get_or_create_pseudonym_new_user():
+    """First-time publish: creates a new pseudonym in per-user SQLite."""
+    mock_store = MagicMock()
+    mock_store.get_current_pseudonym.return_value = None
+    result = get_or_create_pseudonym(
+        store=mock_store,
+        directus_user_id="user-123",
+        requested_name="PastaWitch",
+    )
+    mock_store.set_pseudonym.assert_called_once_with("user-123", "PastaWitch")
+    assert result == "PastaWitch"
+
+
+def test_get_or_create_pseudonym_existing():
+    """If user already has a pseudonym, return it without creating a new one."""
+    mock_store = MagicMock()
+    mock_store.get_current_pseudonym.return_value = "PastaWitch"
+    result = get_or_create_pseudonym(
+        store=mock_store,
+        directus_user_id="user-123",
+        requested_name=None,
+    )
+    mock_store.set_pseudonym.assert_not_called()
+    assert result == "PastaWitch"
+
+
+def test_get_or_create_pseudonym_email_rejected():
+    """Pseudonyms with @ are rejected to prevent PII leakage."""
+    mock_store = MagicMock()
+    mock_store.get_current_pseudonym.return_value = None
+    with pytest.raises(ValueError, match="@"):
+        get_or_create_pseudonym(
+            store=mock_store,
+            directus_user_id="user-123",
+            requested_name="user@example.com",
+        )
+
+
+def test_get_or_create_pseudonym_blank_name_raises():
+    """Empty requested_name raises when no existing pseudonym."""
+    mock_store = MagicMock()
+    mock_store.get_current_pseudonym.return_value = None
+    with pytest.raises(ValueError):
+        get_or_create_pseudonym(
+            store=mock_store,
+            directus_user_id="user-123",
+            requested_name="",
+        )
+
+
+def test_kiwi_community_store_list_meal_plans_filters_by_plan_type():
+    """KiwiCommunityStore.list_meal_plans calls list_posts with post_type='plan'."""
+    store = KiwiCommunityStore.__new__(KiwiCommunityStore)
+    with patch.object(store, "list_posts", return_value=[]) as mock_list:
+        result = store.list_meal_plans(limit=10)
+        mock_list.assert_called_once()
+        call_kwargs = mock_list.call_args.kwargs
+        assert call_kwargs.get("post_type") == "plan"

tests/services/community/test_element_snapshot.py

@@ -0,0 +1,77 @@
+# tests/services/community/test_element_snapshot.py
+import pytest
+from unittest.mock import MagicMock
+from app.services.community.element_snapshot import compute_snapshot, ElementSnapshot
+
+
+def make_mock_store(recipe_rows: list[dict]) -> MagicMock:
+    store = MagicMock()
+    store.get_recipes_by_ids.return_value = recipe_rows
+    return store
+
+
+RECIPE_ROW = {
+    "id": 1,
+    "name": "Spaghetti Carbonara",
+    "ingredient_names": ["pasta", "eggs", "guanciale", "pecorino"],
+    "keywords": ["italian", "quick", "dinner"],
+    "category": "dinner",
+    "fat": 22.0,
+    "protein": 18.0,
+    "moisture": 45.0,
+    "seasoning_score": 0.7,
+    "richness_score": 0.8,
+    "brightness_score": 0.2,
+    "depth_score": 0.6,
+    "aroma_score": 0.5,
+    "structure_score": 0.9,
+    "texture_profile": "creamy",
+}
+
+
+def test_compute_snapshot_basic():
+    store = make_mock_store([RECIPE_ROW])
+    snap = compute_snapshot(recipe_ids=[1], store=store)
+    assert isinstance(snap, ElementSnapshot)
+    assert 0.0 <= snap.seasoning_score <= 1.0
+    assert snap.texture_profile == "creamy"
+
+
+def test_compute_snapshot_averages_multiple_recipes():
+    row2 = {**RECIPE_ROW, "id": 2, "seasoning_score": 0.3, "richness_score": 0.2}
+    store = make_mock_store([RECIPE_ROW, row2])
+    snap = compute_snapshot(recipe_ids=[1, 2], store=store)
+    # seasoning: average of 0.7 and 0.3 = 0.5
+    assert abs(snap.seasoning_score - 0.5) < 0.01
+
+
+def test_compute_snapshot_allergen_flags_detected():
+    row = {**RECIPE_ROW, "ingredient_names": ["pasta", "eggs", "milk", "shrimp", "peanuts"]}
+    store = make_mock_store([row])
+    snap = compute_snapshot(recipe_ids=[1], store=store)
+    assert "gluten" in snap.allergen_flags   # pasta
+    assert "dairy" in snap.allergen_flags    # milk
+    assert "shellfish" in snap.allergen_flags  # shrimp
+    assert "nuts" in snap.allergen_flags     # peanuts
+
+
+def test_compute_snapshot_dietary_tags_vegetarian():
+    row = {**RECIPE_ROW, "ingredient_names": ["pasta", "eggs", "tomato", "basil"]}
+    store = make_mock_store([row])
+    snap = compute_snapshot(recipe_ids=[1], store=store)
+    assert "vegetarian" in snap.dietary_tags
+
+
+def test_compute_snapshot_no_recipes_returns_defaults():
+    store = make_mock_store([])
+    snap = compute_snapshot(recipe_ids=[], store=store)
+    assert snap.seasoning_score == 0.0
+    assert snap.dietary_tags == ()
+    assert snap.allergen_flags == ()
+
+
+def test_element_snapshot_immutable():
+    store = make_mock_store([RECIPE_ROW])
+    snap = compute_snapshot(recipe_ids=[1], store=store)
+    with pytest.raises((AttributeError, TypeError)):
+        snap.seasoning_score = 0.0  # type: ignore

tests/services/community/test_feed.py

@@ -0,0 +1,51 @@
+# tests/services/community/test_feed.py
+import pytest
+from datetime import datetime, timezone
+from app.services.community.feed import posts_to_rss
+
+
+def make_post_dict(**kwargs):
+    defaults = dict(
+        slug="kiwi-plan-test-pasta-week",
+        title="Pasta Week",
+        description="Seven days of carbs",
+        published=datetime(2026, 4, 12, 12, 0, 0, tzinfo=timezone.utc),
+        post_type="plan",
+        pseudonym="PastaWitch",
+    )
+    defaults.update(kwargs)
+    return defaults
+
+
+def test_rss_is_valid_xml():
+    import xml.etree.ElementTree as ET
+    rss = posts_to_rss([make_post_dict()], base_url="https://menagerie.circuitforge.tech/kiwi")
+    root = ET.fromstring(rss)
+    assert root.tag == "rss"
+    assert root.attrib.get("version") == "2.0"
+
+
+def test_rss_contains_item():
+    import xml.etree.ElementTree as ET
+    rss = posts_to_rss([make_post_dict()], base_url="https://menagerie.circuitforge.tech/kiwi")
+    root = ET.fromstring(rss)
+    items = root.findall(".//item")
+    assert len(items) == 1
+
+
+def test_rss_item_has_required_fields():
+    import xml.etree.ElementTree as ET
+    rss = posts_to_rss([make_post_dict()], base_url="https://menagerie.circuitforge.tech/kiwi")
+    root = ET.fromstring(rss)
+    item = root.find(".//item")
+    assert item.find("title") is not None
+    assert item.find("link") is not None
+    assert item.find("pubDate") is not None
+
+
+def test_rss_empty_posts():
+    import xml.etree.ElementTree as ET
+    rss = posts_to_rss([], base_url="https://menagerie.circuitforge.tech/kiwi")
+    root = ET.fromstring(rss)
+    items = root.findall(".//item")
+    assert len(items) == 0

tests/services/community/test_mdns.py

@@ -0,0 +1,39 @@
+# tests/services/community/test_mdns.py
+import pytest
+from unittest.mock import MagicMock, patch
+from app.services.community.mdns import KiwiMDNS
+
+
+def test_mdns_does_not_advertise_when_disabled():
+    """When enabled=False, KiwiMDNS does not register any zeroconf service."""
+    with patch("app.services.community.mdns.Zeroconf") as mock_zc:
+        mdns = KiwiMDNS(enabled=False, port=8512, feed_url="http://localhost:8512/api/v1/community/local-feed")
+        mdns.start()
+        mock_zc.assert_not_called()
+
+
+def test_mdns_advertises_when_enabled():
+    with patch("app.services.community.mdns.Zeroconf") as mock_zc_cls:
+        with patch("app.services.community.mdns.ServiceInfo") as mock_si:
+            mock_zc = MagicMock()
+            mock_zc_cls.return_value = mock_zc
+            mdns = KiwiMDNS(enabled=True, port=8512, feed_url="http://localhost:8512/api/v1/community/local-feed")
+            mdns.start()
+            mock_zc.register_service.assert_called_once()
+
+
+def test_mdns_stop_unregisters_when_enabled():
+    with patch("app.services.community.mdns.Zeroconf") as mock_zc_cls:
+        with patch("app.services.community.mdns.ServiceInfo"):
+            mock_zc = MagicMock()
+            mock_zc_cls.return_value = mock_zc
+            mdns = KiwiMDNS(enabled=True, port=8512, feed_url="http://localhost:8512/api/v1/community/local-feed")
+            mdns.start()
+            mdns.stop()
+            mock_zc.unregister_service.assert_called_once()
+            mock_zc.close.assert_called_once()
+
+
+def test_mdns_stop_is_noop_when_not_started():
+    mdns = KiwiMDNS(enabled=False, port=8512, feed_url="http://localhost/feed")
+    mdns.stop()  # must not raise