hive-c0re: reconcile declared agents periodically, with backoff

hive-c0re/src/main.rs

@@ -342,6 +342,9 @@ async fn cmd_serve(
     // previously-running container goes away without an operator-initiated
     // transient state — a swarm-level grafana alert matches that line.
     crash_watch::spawn(coord.clone());
+    // Periodic reconcile: queues a start for an agent that is declared up and
+    // found down. The crash alert above keeps firing; this only converges.
+    workers::reconcile_tick::spawn(coord.clone());
     // Agent-sockets marker poll: re-fires `agent_sockets::write`
     // and `gateway_nginx::write` every 10s so the JSON and nginx
     // config pick up newly-bound `.bound` markers after a rebuild.