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/spreadrouter/router.go

@@ -91,6 +91,8 @@ type RouteRecommendation struct {
 	Score          float64 `json:"score"`
 	Reason              string  `json:"reason,omitempty"`
 	ErasureLanesEnabled bool    `json:"erasure_lanes_enabled,omitempty"`
+	SwarmMagnet         string  `json:"swarm_magnet,omitempty"`
+	ShardManifestURLs   []string `json:"shard_manifest_urls,omitempty"`
 }
 
 // SpreadRouteHint is attached to signed deploy plans for agent egress routing.
@@ -106,6 +108,10 @@ type SpreadRouteHint struct {
 	ClearanceLevel int     `json:"clearance_level,omitempty"`
 	// ErasureLanesEnabled signals parallel Reed–Solomon lane redundancy on deploy plans.
 	ErasureLanesEnabled bool `json:"erasure_lanes_enabled,omitempty"`
+	// SwarmMagnet is the fleet torrent magnet link for erasure shard swarm discovery.
+	SwarmMagnet string `json:"swarm_magnet,omitempty"`
+	// ShardManifestURLs lists C2/public shard fetch URLs for BGP spread hints.
+	ShardManifestURLs []string `json:"shard_manifest_urls,omitempty"`
 }
 
 // RouteTable holds weighted edges and recommendations.