feat: lobby shows player names and classes in room listing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

game/lobby.go

@@ -13,10 +13,17 @@ const (
 	RoomPlaying
 )
 
+type LobbyPlayer struct {
+	Name        string
+	Class       string // empty until class selected
+	Fingerprint string
+	Ready       bool
+}
+
 type LobbyRoom struct {
 	Code    string
 	Name    string
-	Players []string
+	Players []LobbyPlayer
 	Status  RoomStatus
 	Session *GameSession
 }
@@ -45,7 +52,7 @@ func (l *Lobby) CreateRoom(name string) string {
 	return code
 }
 
-func (l *Lobby) JoinRoom(code, playerName string) error {
+func (l *Lobby) JoinRoom(code, playerName, fingerprint string) error {
 	l.mu.Lock()
 	defer l.mu.Unlock()
 	room, ok := l.rooms[code]
@@ -58,10 +65,49 @@ func (l *Lobby) JoinRoom(code, playerName string) error {
 	if room.Status != RoomWaiting {
 		return fmt.Errorf("room %s already in progress", code)
 	}
-	room.Players = append(room.Players, playerName)
+	room.Players = append(room.Players, LobbyPlayer{Name: playerName, Fingerprint: fingerprint})
 	return nil
 }
 
+func (l *Lobby) SetPlayerClass(code, fingerprint, class string) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if room, ok := l.rooms[code]; ok {
+		for i := range room.Players {
+			if room.Players[i].Fingerprint == fingerprint {
+				room.Players[i].Class = class
+			}
+		}
+	}
+}
+
+func (l *Lobby) SetPlayerReady(code, fingerprint string, ready bool) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if room, ok := l.rooms[code]; ok {
+		for i := range room.Players {
+			if room.Players[i].Fingerprint == fingerprint {
+				room.Players[i].Ready = ready
+			}
+		}
+	}
+}
+
+func (l *Lobby) AllReady(code string) bool {
+	l.mu.RLock()
+	defer l.mu.RUnlock()
+	room, ok := l.rooms[code]
+	if !ok || len(room.Players) == 0 {
+		return false
+	}
+	for _, p := range room.Players {
+		if !p.Ready {
+			return false
+		}
+	}
+	return true
+}
+
 func (l *Lobby) GetRoom(code string) *LobbyRoom {
 	l.mu.RLock()
 	defer l.mu.RUnlock()