feat(meal-planner): add delete_meal_plan_entry tool (v0.11.4)

Reuses the existing metadelete endpoint (already used for tasks and
recipes). Validates that entry_id starts with 'dish/' or 'meal/' before
calling the API. SPEC.md updated to reflect metadelete's broader scope.

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

README.md

@@ -2,7 +2,7 @@
 
 MCP server for [Family Wall](https://www.familywall.com) -- read and manage your family's circles, lists, tasks, and recipes directly from Claude.
 
-## Features (v0.11.3)
+## Features (v0.11.4)
 
 ### Read
 
@@ -34,6 +34,7 @@ MCP server for [Family Wall](https://www.familywall.com) -- read and manage your
 - `delete_recipe` -- permanently delete a recipe (only own recipes)
 - `add_recipe_to_meal_plan` -- add a recipe from the recipe box to the meal plan for a specific date and meal slot (BREAKFAST/LUNCH/SNACK/DINNER)
 - `add_meal_to_meal_plan` -- add a free-text meal entry (no recipe) to the meal plan for a specific date and meal slot
+- `delete_meal_plan_entry` -- permanently delete a meal plan entry (works for both `dish/…` and `meal/…` entries)
 - `create_circle` -- create a new Family Wall circle (group)
 - `update_circle` -- rename a circle (server capitalises first letter; only name is changeable via API; primary circle is protected)
 - `delete_circle` -- permanently delete a circle and all its content (primary circle is protected)