feat: export JoinRoom/LeaveRoom on hub to satisfy extended WSHub interface

The gameserver plugin's WSHub interface now requires JoinRoom and LeaveRoom
so spectator steps can manage room membership. Add exported wrappers on hub
and update the package-level Hub interface to match.

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

Author: intel352

internal/hub.go

@@ -157,6 +157,18 @@ func (h *hub) broadcastToRoom(room string, msg []byte, exclude string) {
 	}
 }
 
+// JoinRoom adds connID to the named room. Returns true if the connection was registered.
+// This satisfies the gameserver plugin's ws_bridge.WSHub interface.
+func (h *hub) JoinRoom(connID, room string) bool {
+	return h.joinRoom(connID, room)
+}
+
+// LeaveRoom removes connID from the named room.
+// This satisfies the gameserver plugin's ws_bridge.WSHub interface.
+func (h *hub) LeaveRoom(connID, room string) {
+	h.leaveRoom(connID, room)
+}
+
 // BroadcastToRoom sends msg to all connections in room, returning the recipient count.
 // This satisfies the gameserver plugin's ws_bridge.WSHub interface.
 func (h *hub) BroadcastToRoom(room string, msg []byte) int {

plugin.go

@@ -11,10 +11,12 @@ func NewWebSocketPlugin() sdk.PluginProvider {
 	return internal.NewWebSocketPlugin()
 }
 
-// Hub is an exported interface for the WebSocket hub's broadcast capabilities.
+// Hub is an exported interface for the WebSocket hub's room and broadcast capabilities.
 // Satisfied by the internal hub after the ws.server module is initialized.
 type Hub interface {
 	BroadcastToRoom(room string, msg []byte) int
+	JoinRoom(connID, room string) bool
+	LeaveRoom(connID, room string)
 }
 
 // GetHub returns the global WebSocket hub once the ws.server module has been