feat(multiplayer): persist ranked arena allocations

server/domain/allocator.go

@@ -31,6 +31,7 @@ type AllocationRequest struct {
 	Region       string
 	Build        string
 	Protocol     int
+	ArenaPath    string
 	Transport    string
 }
 
@@ -142,5 +143,5 @@ func validateAllocationRequest(request AllocationRequest) error {
 }
 
 func allocationDigest(request AllocationRequest) [32]byte {
-	return sha256.Sum256([]byte(fmt.Sprintf("%s\x00%s\x00%s\x00%s\x00%d\x00%s", request.AllocationID, request.MatchID, request.Region, request.Build, request.Protocol, request.Transport)))
+	return sha256.Sum256([]byte(fmt.Sprintf("%s\x00%s\x00%s\x00%s\x00%d\x00%s\x00%s", request.AllocationID, request.MatchID, request.Region, request.Build, request.Protocol, request.Transport, request.ArenaPath)))
 }

server/domain/formation.go

@@ -74,6 +74,9 @@ func PrepareProposal(id string, playlist Playlist, formation MatchFormation, ran
 	}
 	proposal.Region = formation.Selection.Region
 	proposal.Protocol = formation.Selection.Players[0].ProtocolVersion
+	if playlist == Ranked {
+		proposal.ArenaPath = arena.Path
+	}
 	for _, player := range formation.Selection.Players {
 		if player.ProtocolVersion != proposal.Protocol {
 			return PreparedProposal{}, fmt.Errorf("formed match has mixed protocols")

server/domain/proposal.go

@@ -43,6 +43,7 @@ type Proposal struct {
 	Playlist     Playlist
 	Region       string
 	Protocol     int
+	ArenaPath    string
 	Participants []ProposalParticipant
 	State        State
 	Revision     uint64

server/domain/ranked.go

@@ -11,7 +11,8 @@ type RankedParticipant struct {
 }
 
 type RankedArena struct {
-	ID string
+	ID   string
+	Path string
 }
 
 // rankedArenas is the server-owned eligibility registry for launch ranked
@@ -19,9 +20,9 @@ type RankedArena struct {
 // project, but deliberately excludes every elevated-goal variant until a
 // policy trained for that geometry is promoted.
 var rankedArenas = map[string]RankedArena{
-	"arena_01": {ID: "arena_01"},
-	"arena_02": {ID: "arena_02"},
-	"arena_03": {ID: "arena_03"},
+	"arena_01": {ID: "arena_01", Path: "res://scenes/arena_01.tscn"},
+	"arena_02": {ID: "arena_02", Path: "res://scenes/arena_02.tscn"},
+	"arena_03": {ID: "arena_03", Path: "res://scenes/arena_03.tscn"},
 }
 
 // DefaultRankedArena supplies a safe server-owned eligibility decision while