Add Web PubSub Chat topics, collections and lifecycle request models

.github/copilot-instructions.md

@@ -16,3 +16,11 @@ guidance.
   local validation.
 - Prefer focused changes and the smallest existing validation that covers
   them. Do not claim a check passed unless it was run successfully.
+
+## Learnings
+
+When addressing PR feedback, reply in each addressed review thread with the
+change or deliberate no-change decision and validation evidence. After pushing,
+recheck previously addressed threads and resolve those whose fixes are now
+published and verified. Do not leave delivered fixes open, or resolve a thread
+merely because a fix exists locally; explain and retain unresolved blockers.

sdk/webpubsub/azure-messaging-webpubsubchatservice/CHANGELOG.md

@@ -1,5 +1,25 @@
 # Release History
 
+## 1.0.0b2 (2026-11-13)
+
+### Features Added
+
+  - Added topic lifecycle operations (create or replace, list, get, update, and soft delete). Creation or replacement accepts `ChatTopicCreateOrReplace`, which requires `title` and accepts optional `state` for replacement; updates accept `ChatTopicUpdate`, whose fields are optional.
+  - Added room, user, and user-room collection operations
+
+### Other Changes
+
+  - Changed the default service API version from `2026-02-01-preview` to `2026-08-01-preview` for both existing and newly added Chat operations
+  - Clarified that message IDs are pagination cursors for `list_messages`. The pager follows the service's `nextLink`; resume with `by_page(continuation_token=...)`.
+
+### Breaking Changes
+
+  - Renamed request-body parameters from `resource` to `role`, `room`, `member`, `user`, `topic`, or `message`, matching the operation's resource. Positional calls are unchanged.
+  - Renamed `ChatConversation.parent_room` to `room_id`. The JSON field remains `parentRoom`.
+  - Removed the `continuation_token_parameter` argument from listing operations. Resume paging with `by_page(continuation_token=...)` on the returned `ItemPaged` or `AsyncItemPaged` instead.
+  - Create or replace operations now accept dedicated `ChatRoleCreateOrReplace`, `ChatRoomCreateOrReplace`, `ChatRoomMemberCreateOrReplace`, and `ChatUserCreateOrReplace` (including `HumanChatUserCreateOrReplace`) request models instead of resource response models.
+  - Message updates accept `ChatMessageUpdate`, whose fields are optional, instead of `ChatMessage`. Resource response model names are unchanged.
+
 ## 1.0.0b1 (2026-10-08)
 
 ### Features Added