fix: restore interactive PTY behavior

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a03397-4d51-7fd1-8ff2-946eb22ea2bc

src/tamq/service.py

@@ -74,10 +74,13 @@ class Service:
     def _deliver_once(self) -> None:
         for endpoint in self.store.endpoints():
             repos = json.loads(endpoint["repos"])
+            control = ControlModeClient(endpoint["session"])
+            if not control.session_exists(expected_pid=int(endpoint["pid"])):
+                self.store.disconnect_endpoint(endpoint["endpoint_id"])
+                continue
             pending = [row for row in self.store.list(state="pending") if row["endpoint_id"] in (None, endpoint["endpoint_id"]) and row["target_repo"] in repos]
             if not pending:
                 continue
-            control = ControlModeClient(endpoint["session"])
             try:
                 control.start()
                 for row in pending: