Fix LLM validation and dashboard health hot paths

backend/src/core/task_manager/context.py

@@ -8,7 +8,7 @@
 
 # [SECTION: IMPORTS]
 # [SECTION: IMPORTS]
-from typing import Dict, Any, Callable
+from typing import Dict, Any, Callable, Optional
 from .task_logger import TaskLogger
 from ..logger import belief_scope
 # [/SECTION]
@@ -58,11 +58,13 @@ class TaskContext:
         task_id: str,
         add_log_fn: Callable,
         params: Dict[str, Any],
-        default_source: str = "plugin"
+        default_source: str = "plugin",
+        background_tasks: Optional[Any] = None,
     ):
         with belief_scope("__init__"):
             self._task_id = task_id
             self._params = params
+            self._background_tasks = background_tasks
             self._logger = TaskLogger(
                 task_id=task_id,
                 add_log_fn=add_log_fn,
@@ -102,6 +104,16 @@ class TaskContext:
         with belief_scope("params"):
             return self._params
     # [/DEF:params:Function]
+
+    # [DEF:background_tasks:Function]
+    # @PURPOSE: Expose optional background task scheduler for plugins that dispatch deferred side effects.
+    # @PRE: TaskContext must be initialized.
+    # @POST: Returns BackgroundTasks-like object or None.
+    @property
+    def background_tasks(self) -> Optional[Any]:
+        with belief_scope("background_tasks"):
+            return self._background_tasks
+    # [/DEF:background_tasks:Function]
     
     # [DEF:get_param:Function]
     # @PURPOSE: Get a specific parameter value with optional default.
@@ -128,7 +140,8 @@ class TaskContext:
                 task_id=self._task_id,
                 add_log_fn=self._logger._add_log,
                 params=self._params,
-                default_source=source
+                default_source=source,
+                background_tasks=self._background_tasks,
             )
     # [/DEF:create_sub_context:Function]