feat: add like_post tool via wallmood endpoint (v0.4.2)

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

src/mcp_familywall/server.py

@@ -471,6 +471,56 @@ def delete_task(task_id: str) -> str:
     return json.dumps({"deleted": True, "id": task_id}, ensure_ascii=False, indent=2)
 
 
+# ---------------------------------------------------------------------------
+# Tool: like_post
+# ---------------------------------------------------------------------------
+
+
+@mcp.tool()
+def like_post(post_id: str, like: bool = True) -> str:
+    """Like or unlike a wall post/activity.
+
+    Args:
+        post_id: Wall post ID from get_activities (e.g. ``wall/23431854_31119189``).
+        like: ``True`` to like the post, ``False`` to unlike.
+
+    Returns:
+        JSON success indicator or an error message.
+    """
+    # wallmood is a toggle endpoint — same endpoint for like and unlike.
+    # The 'like' parameter controls the intended state; since the endpoint
+    # toggles server-side state, it is sent as 'moodType' to allow the server
+    # to differentiate. Exact parameter names to be verified via FW_DEBUG=1.
+    params: dict[str, Any] = {
+        "wallId": post_id,
+        "moodType": "LIKE" if like else "NONE",
+    }
+
+    try:
+        data = _authenticated_call("wallmood", params)
+    except RuntimeError as exc:
+        return f"Error: {exc}"
+
+    # The response structure is not yet fully verified — return raw JSON
+    # if the expected shape is absent so the caller can inspect it.
+    try:
+        result_data = data["a00"]["r"]["r"]
+        if result_data is None:
+            raise KeyError("empty result")
+    except (KeyError, TypeError):
+        return json.dumps(
+            {"warning": "Unexpected wallmood response structure", "raw": data},
+            ensure_ascii=False,
+            indent=2,
+        )
+
+    return json.dumps(
+        {"liked": like, "id": post_id},
+        ensure_ascii=False,
+        indent=2,
+    )
+
+
 # ---------------------------------------------------------------------------
 # Factory
 # ---------------------------------------------------------------------------