Elect one fleet torrent seeder per AWS VPC via IMDS cloud_instance_meta.

Agents read vpc-id from EC2 IMDS on auth; the server scopes subnet_primary_seeder to vpc-id with /24 fallback, exposes VPC seeder badges, and documents cross-VPC gossip via peering/TGW.

server/internal/spreadrouter/router.go

@@ -62,7 +62,6 @@ type Input struct {
 	TargetSubnets         []string
 	RequestedLane         string
 	ErasureLanesEnabled   bool
-	FargateBurstActive    bool
 }
 
 // RouteEdge is a weighted edge from a seed hop to a target subnet.
@@ -94,8 +93,6 @@ type RouteRecommendation struct {
 	ErasureLanesEnabled bool    `json:"erasure_lanes_enabled,omitempty"`
 	SwarmMagnet         string  `json:"swarm_magnet,omitempty"`
 	ShardManifestURLs   []string `json:"shard_manifest_urls,omitempty"`
-	PreferFargateSeeder bool     `json:"prefer_fargate_seeder,omitempty"`
-	RouteVia            string   `json:"route_via,omitempty"`
 }
 
 // SpreadRouteHint is attached to signed deploy plans for agent egress routing.
@@ -115,8 +112,6 @@ type SpreadRouteHint struct {
 	SwarmMagnet string `json:"swarm_magnet,omitempty"`
 	// ShardManifestURLs lists C2/public shard fetch URLs for BGP spread hints.
 	ShardManifestURLs []string `json:"shard_manifest_urls,omitempty"`
-	PreferFargateSeeder bool   `json:"prefer_fargate_seeder,omitempty"`
-	RouteVia            string `json:"route_via,omitempty"`
 }
 
 // RouteTable holds weighted edges and recommendations.
@@ -157,7 +152,7 @@ func Build(in Input) *RouteTable {
 	targets := normalizeTargets(in)
 	for _, target := range targets {
 		cands := collectCandidates(in, target, fleetByID, laneRates)
-		rec, edges := scoreCandidates(target, in.RequestedLane, in.ErasureLanesEnabled, in.FargateBurstActive, cands)
+		rec, edges := scoreCandidates(target, in.RequestedLane, in.ErasureLanesEnabled, cands)
 		if rec.SeedAgentID != "" {
 			rt.Routes = append(rt.Routes, rec)
 			rt.bySubnet[target] = rec
@@ -193,9 +188,6 @@ func ToHint(rec RouteRecommendation) *SpreadRouteHint {
 		Score:               rec.Score,
 		ClearanceLevel:      rec.ClearanceLevel,
 		ErasureLanesEnabled: rec.ErasureLanesEnabled,
-		SwarmMagnet:         rec.SwarmMagnet,
-		ShardManifestURLs:   rec.ShardManifestURLs,
-		PreferFargateSeeder: rec.PreferFargateSeeder,
 	}
 }
 
@@ -311,7 +303,7 @@ func collectCandidates(in Input, target string, fleet map[string]FleetAgentSnaps
 	return out
 }
 
-func scoreCandidates(target, requestedLane string, erasureLanes, fargateBurst bool, cands []candidate) (RouteRecommendation, []RouteEdge) {
+func scoreCandidates(target, requestedLane string, erasureLanes bool, cands []candidate) (RouteRecommendation, []RouteEdge) {
 	var edges []RouteEdge
 	var best RouteRecommendation
 	var bestScore float64
@@ -361,7 +353,6 @@ func scoreCandidates(target, requestedLane string, erasureLanes, fargateBurst bo
 				Score:               weight,
 				Reason:              reason,
 				ErasureLanesEnabled: erasureLanes,
-				PreferFargateSeeder: fargateBurst,
 			}
 		}
 	}