fix(wall-posts): add delete_wall_post and fix add_comment response parser (v1.3.1)

- Fix add_comment response parser: corrected to a00.r.r.comment.commentId structure
- Fix add_comment error handling: return errors directly instead of warnings
- Add delete_wall_post: permanently delete wall posts via metadelete endpoint
- Add delete_wall_post to README.md Wall & Activities section
- Update SPEC.md with correct walladdComment response structure
- Update SPEC.md metadelete to include wall posts as supported type
- Update CHANGELOG.md with v1.3.1 bugfixes and additions
- Version bumped to 1.3.1 in pyproject.toml

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

src/mcp_familywall/server.py

@@ -2042,9 +2042,8 @@ def get_wall_posts(limit: int = 20) -> str:
         raw_author: str = item.get("accountId", "")
         mood_map: dict[str, Any] = item.get("moodMap") or {}
 
-        liked_by_me = (
-            item.get("moodStarShortcut") == "true"
-            or any("STAR" in moods for moods in mood_map.values())
+        liked_by_me = item.get("moodStarShortcut") == "true" or any(
+            "STAR" in moods for moods in mood_map.values()
         )
 
         like_count = sum(len(moods) for moods in mood_map.values() if isinstance(moods, list))
@@ -2164,22 +2163,66 @@ def add_comment(post_id: str, comment: str) -> str:
         return _err(f"Connection error: {exc}")
 
     try:
-        comment_obj = data["a00"]["r"]["r"]
-        if not isinstance(comment_obj, dict) or "metaId" not in comment_obj:
-            raise TypeError("unexpected shape")
-    except (KeyError, TypeError):
+        response_obj = data["a00"]["r"]["r"]
+        if not isinstance(response_obj, dict):
+            raise TypeError("a00.r.r is not a dict")
+        comment_obj = response_obj.get("comment")
+        if not isinstance(comment_obj, dict) or "commentId" not in comment_obj:
+            raise TypeError("comment object missing or invalid")
+    except (KeyError, TypeError) as exc:
+        return _err(f"Unexpected walladdComment response structure: {exc}")
+
+    return json.dumps(
+        {
+            "created": True,
+            "id": comment_obj.get("commentId"),
+            "post_id": post_id,
+            "text": comment_obj.get("text"),
+            "date": comment_obj.get("creationDate"),
+        },
+        ensure_ascii=False,
+        indent=2,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Tool: delete_wall_post
+# ---------------------------------------------------------------------------
+
+
+@mcp.tool()
+def delete_wall_post(post_id: str) -> str:
+    """Permanently delete a wall post.
+
+    IMPORTANT: Ask the user for confirmation before calling this tool.
+
+    Args:
+        post_id: Wall post metaId from get_wall_posts
+            (e.g. ``"wall/16282169_31146617"``).
+
+    Returns:
+        JSON success indicator or an error message.
+    """
+    try:
+        data = _authenticated_call("metadelete", {"id": post_id})
+    except RuntimeError as exc:
+        return _err(str(exc))
+
+    try:
+        result = data["a00"]["r"]["r"]
+        if result != "true":
+            raise ValueError(f"Unexpected result: {result}")
+    except (KeyError, ValueError) as exc:
         return json.dumps(
-            {"warning": "Unexpected walladdComment response structure", "raw": data},
+            {"warning": "Unexpected metadelete response structure", "error": str(exc), "raw": data},
             ensure_ascii=False,
             indent=2,
         )
 
     return json.dumps(
         {
-            "id": comment_obj.get("metaId"),
-            "post_id": post_id,
-            "text": comment_obj.get("text") or comment_obj.get("comment"),
-            "date": comment_obj.get("creationDate"),
+            "deleted": True,
+            "id": post_id,
         },
         ensure_ascii=False,
         indent=2,