Temporary chat framework fixes (for tests to run without crashes/hangs).

Sources/AblyChat/ChatClient.swift

@@ -28,7 +28,7 @@ public actor DefaultChatClient: ChatClient {
     }
 
     public nonisolated var clientID: String {
-        fatalError("Not yet implemented")
+        realtime.clientId ?? "<Noname>"
     }
 }
 

Sources/AblyChat/DefaultMessages.swift

@@ -35,7 +35,7 @@ internal final class DefaultMessages: Messages, EmitsDiscontinuities {
     // (CHA-M4) Messages can be received via a subscription in realtime.
     internal func subscribe(bufferingPolicy: BufferingPolicy) async throws -> MessageSubscription {
         let uuid = UUID()
-        let timeserial = try await resolveSubscriptionStart()
+        let timeserial = channel.properties.channelSerial
         let messageSubscription = MessageSubscription(
             bufferingPolicy: bufferingPolicy
         ) { [weak self] queryOptions in
@@ -44,7 +44,7 @@ internal final class DefaultMessages: Messages, EmitsDiscontinuities {
         }
 
         // (CHA-M4a) A subscription can be registered to receive incoming messages. Adding a subscription has no side effects on the status of the room or the underlying realtime channel.
-        subscriptionPoints[uuid] = .init(subscription: messageSubscription, timeserial: timeserial)
+        subscriptionPoints[uuid] = .init(subscription: messageSubscription, timeserial: timeserial ?? "")
 
         // (CHA-M4c) When a realtime message with name set to message.created is received, it is translated into a message event, which contains a type field with the event type as well as a message field containing the Message Struct. This event is then broadcast to all subscribers.
         // (CHA-M4d) If a realtime message with an unknown name is received, the SDK shall silently discard the message, though it may log at DEBUG or TRACE level.

Sources/AblyChat/Errors.swift

@@ -14,7 +14,7 @@ public enum ErrorCode: Int {
     /// ``Rooms.get(roomID:options:)`` was called with a different set of room options than was used on a previous call. You must first release the existing room instance using ``Rooms.release(roomID:)``.
     ///
     /// TODO this code is a guess, revisit in https://github.com/ably-labs/ably-chat-swift/issues/32
-    case inconsistentRoomOptions = 1
+    case inconsistentRoomOptions = 40000
 
     case messagesAttachmentFailed = 102_001
     case presenceAttachmentFailed = 102_002