Fix coverage filename→name, fix TasksProxy auto-save for multi-worker

app.py.final

@@ -52,10 +52,13 @@ class TasksProxy:
     def __setitem__(self, key, value):
         with _task_lock:
             tasks = _load_tasks()
-            tasks[key] = value
+            if isinstance(value, dict):
+                tasks[key] = value
+            else:
+                tasks[key] = value
             _save_tasks(tasks)
     def __getitem__(self, key):
-        return _load_tasks()[key]
+        return _TaskDict(key)
     def __contains__(self, key):
         return key in _load_tasks()
     def pop(self, key, *args):
@@ -65,6 +68,21 @@ class TasksProxy:
             _save_tasks(tasks)
             return result
 
+class _TaskDict(dict):
+    """Auto-saving dict wrapper for a single task."""
+    def __init__(self, task_id):
+        self._task_id = task_id
+        tasks = _load_tasks()
+        super().__init__(tasks.get(task_id, {}))
+    def __setitem__(self, key, value):
+        super().__setitem__(key, value)
+        with _task_lock:
+            tasks = _load_tasks()
+            if self._task_id not in tasks:
+                tasks[self._task_id] = {}
+            tasks[self._task_id][key] = value
+            _save_tasks(tasks)
+
 TASKS = TasksProxy()
 
 # ========== UTILITY FUNCTIONS ==========