feat(meal-planner): add get_meal_plan read-only tool (v0.10.0)

- Implement get_meal_plan() tool for accessing Family Wall meal planner
- Parameters: date_from, date_to (ISO 8601 format)
- Returns raw JSON for initial verification via FW_DEBUG=1
- Response structure to be verified in first deployment
- Add Meal Planner API section to SPEC.md documenting mplistinterval and other endpoints
- Update version to 0.10.0 in __init__.py and pyproject.toml
- Update README.md and CLAUDE.md with tool info and roadmap

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/mcp_familywall/__init__.py

@@ -1 +1 @@
-__version__ = "0.9.1"
+__version__ = "0.10.0"

src/mcp_familywall/server.py

@@ -2210,6 +2210,31 @@ def update_recipe(
     return json.dumps(result, ensure_ascii=False, indent=2)
 
 
+# ---------------------------------------------------------------------------
+# Tool: get_meal_plan
+# ---------------------------------------------------------------------------
+
+
+@mcp.tool()
+def get_meal_plan(date_from: str, date_to: str) -> str:
+    """Return meal plan entries for a date range.
+
+    Args:
+        date_from: Start date in ISO format (e.g. ``"2026-04-13"``).
+        date_to:   End date in ISO format (e.g. ``"2026-04-19"``).
+
+    Returns:
+        Raw JSON response from the API for initial verification.
+    """
+    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)
+
+
 # ---------------------------------------------------------------------------
 # Factory
 # ---------------------------------------------------------------------------