fix: surface prompt template eval errors, fail-safe async_safety fallback, and set _parent_agent_var in sync wrapper

src/nooa/agent.py

@@ -469,6 +469,7 @@ def _resolve_system_prompt(self) -> str:
                         value = format(value, fmt_spec)
                     parts.append(str(value))
                 except Exception:
+                    logger.debug("Prompt template eval failed for %r", field, exc_info=True)
                     placeholder = field
                     if conversion:
                         placeholder = f"{field}!{conversion}"

src/nooa/runtime/async_safety.py

@@ -43,7 +43,7 @@ def _is_event_loop_thread() -> bool:
         # Compare thread IDs - _thread_id is set when loop starts
         if hasattr(loop, "_thread_id"):
             return bool(getattr(loop, "_thread_id") == current_thread().ident)  # noqa: B009
-        return True  # Assume yes if we can't check
+        return False  # Assumed not event loop thread — err on safe side
     except RuntimeError:
         return False  # No running loop
 

src/nooa/runtime/method_wrapper.py

@@ -434,8 +434,10 @@ def wrapper(self: Any, *args: Any, **kwargs: Any) -> Any:
         # nearest traced ancestor — same semantics as the async wrapper.
         _push_agent_call_id(call_id if _tracing_enabled[0] else parent_call_id)
 
-        # Same agent-call event as the async wrapper. The sync wrapper doesn't
-        # set _parent_agent_var, so read it directly for is_top_level.
+        # Set parent agent for LLM inheritance — subagents instantiated inside
+        # this sync method can inherit the parent's LLM (mirrors async wrapper).
+        parent_token = _parent_agent_var.set(self)
+
         is_top_level = _parent_agent_var.get() is None
         try:
             self.event_manager.add(
@@ -490,6 +492,7 @@ def wrapper(self: Any, *args: Any, **kwargs: Any) -> Any:
             except Exception:  # noqa: BLE001
                 logger.debug("agent-call: AfterAgentCall emission failed (sync)", exc_info=True)
             _pop_agent_call_id()
+            _parent_agent_var.reset(parent_token)
             if hook_context is not None:
                 call_after_hook(
                     "after_agent_call",