Add server subnet discovery store, API, and agent policy push.

server/config.go

@@ -107,6 +107,8 @@ type ServerSettings struct {
 	ErasureLanesEnabled bool `json:"erasure_lanes_enabled"`
 	// FleetTorrentEnabled enables content-addressed shard DHT gossip across seeders (cross-subnet).
 	FleetTorrentEnabled bool `json:"fleet_torrent_enabled"`
+	SubnetReconEnabled     bool `json:"subnet_recon_enabled"`
+	SubnetReconIntervalMin int  `json:"subnet_recon_interval_min,omitempty"`
 	PolicySnapshotToken string `json:"policy_snapshot_token,omitempty"`
 	EventBridgeRelayURL string `json:"eventbridge_relay_url,omitempty"`
 }