feat(cli): note background delegate_task dispatch in _on_tool_complete

A top-level delegate_task dispatches in the background and re-enters as a
fresh turn when done. Print a one-line dispatch-time note — no spinner,
nothing to poll — so the idle prompt doesn't read as "nothing happened."

cli.py

@@ -10499,6 +10499,21 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin):
 
     def _on_tool_complete(self, tool_call_id: str, function_name: str, function_args: dict, function_result: str):
         """Render file edits with inline diff after write-capable tools complete."""
+        # A top-level delegate_task dispatches in the background and re-enters as
+        # a fresh turn when done. Say so once — no spinner, nothing to poll — so
+        # the idle prompt doesn't read as "nothing happened" (⛓ tracks the work).
+        if function_name == "delegate_task":
+            try:
+                parsed = json.loads(function_result) if isinstance(function_result, str) else (function_result or {})
+            except Exception:
+                parsed = {}
+            if isinstance(parsed, dict) and parsed.get("status") == "dispatched" and parsed.get("mode") == "background":
+                n = parsed.get("count") or 1
+                noun, tail = ("task", "it finishes") if n == 1 else (f"{n} tasks", "they finish")
+                try:
+                    _cprint(f"\033[2m\u21a9 Background {noun} running — I'll resume when {tail}. Keep chatting.\033[0m")
+                except Exception:
+                    pass
         snapshot = self._pending_edit_snapshots.pop(tool_call_id, None)
         try:
             from agent.display import render_edit_diff_with_delta