feat(meal-planner): structured output for get_meal_plan (v0.10.1)

- Map mplistinterval response to clean JSON list (id, date, type, name,
  recipe_id, can_update, can_delete) — no more raw dump
- SPEC.md: document verified mplistinterval response structure
- Fix two pre-existing ruff SIM warnings (SIM102, SIM105)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/mcp_familywall/server.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import contextlib
 import json
 import logging
 import os
@@ -1826,10 +1827,8 @@ def get_recipe_categories() -> str:
     """
     # Get the family ID to construct standard category IDs
     family_id: str | None = None
-    try:
+    with contextlib.suppress(RuntimeError):
         family_id = _get_family_id()
-    except RuntimeError:
-        pass
 
     # Collect all category IDs: standard categories + categories found in recipes
     seen_ids: set[str] = set()
@@ -2224,15 +2223,45 @@ def get_meal_plan(date_from: str, date_to: str) -> str:
         date_to:   End date in ISO format (e.g. ``"2026-04-19"``).
 
     Returns:
-        Raw JSON response from the API for initial verification.
+        JSON list of meal plan entries with keys: id, date, type, name,
+        recipe_id, can_update, can_delete.  ``type`` is one of
+        ``BREAKFAST``, ``LUNCH``, ``SNACK``, ``DINNER``.
+        ``recipe_id`` is the linked recipe metaId or ``null`` when the
+        entry is a free-text dish (not linked to a recipe).
+        Returns an error message string on failure.
     """
     try:
         data = _authenticated_call("mplistinterval", {"from": date_from, "to": date_to})
     except RuntimeError as exc:
         return f"Error: {exc}"
 
-    # Return raw JSON for verification — response structure not yet known
-    return json.dumps(data, ensure_ascii=False, indent=2)
+    try:
+        raw_list = data["a00"]["r"]["r"]["list"]
+        if not isinstance(raw_list, list):
+            raise TypeError("a00.r.r.list is not a list")
+    except (KeyError, TypeError):
+        return json.dumps(
+            {"warning": "Unexpected mplistinterval response structure", "raw": data},
+            ensure_ascii=False,
+            indent=2,
+        )
+
+    result = []
+    for dish in raw_list:
+        rights = dish.get("rights") or {}
+        result.append(
+            {
+                "id": dish.get("metaId"),
+                "date": dish.get("date"),
+                "type": dish.get("type"),
+                "name": dish.get("name"),
+                "recipe_id": dish.get("recipeId") or None,
+                "can_update": rights.get("canUpdate") == "true",
+                "can_delete": rights.get("canDelete") == "true",
+            }
+        )
+
+    return json.dumps(result, ensure_ascii=False, indent=2)
 
 
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