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>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mcp-familywall"
-version = "0.9.1"
+version = "0.10.0"
 description = "MCP server for Family Wall — read your family's lists and tasks via Claude"
 readme = "README.md"
 requires-python = ">=3.12"