refactor(llc, persistence)!: route the partial channel and member updates through the generated client

.claude/skills/openapi-migration/SKILL.md

@@ -187,10 +187,13 @@ a public signature.
 
 **Per type, decide:**
 
-- **Which v10 type it maps to, and under what name.** The v10 name is the default, even where the generated one
-  differs (`OGAttachmentResponse` for `GetOGResponse`, `AppSettings` for `AppResponseFields`). It is not a
-  requirement: the user may ask for another name, and you may propose one that fits clearly better. Renaming a
-  v10 type is a break, so propose it with the reason and wait for approval.
+- **Which v10 type it maps to, and under what name.** The spec's name is the default, unless it is awkward or
+  describes something else, and sibling calls share one scheme: `UpdateChannelPartialResponse` and
+  `UpdateMemberPartialResponse` replaced v10's `PartialUpdateChannelResponse` and `PartialUpdateMemberResponse`,
+  and `updateMemberPartial` replaced `partialMemberUpdate`. v10's name stays where the generated one does not fit
+  (`OGAttachmentResponse` for `GetOGResponse`, `AppSettings` for `AppResponseFields`), and names an earlier group
+  settled stand. Renaming a v10 type or method is a break: list it with the reason, wait for approval, and call it
+  out in the PR description.
 - **Which fields it exposes.** v10's fields, with v10's defaults. A field only the generated type has
   (`AppResponseFields.id`, the twelve extra fields on `GetOGResponse`) stays out; exposing it later is additive. A
   field the spec marks optional is nullable by default, even if v10 typed it non-null; keeping it non-null needs a
@@ -251,7 +254,7 @@ packages/stream_chat/lib/src/
 
 - **The role decides the folder.** An envelope goes in `response/` (`CreateUserGroupResponse`). A type the caller
   passes in to shape a request goes in `request/`, whatever its name: `PartialUpdateUserRequest`, and also
-  `PaginationParams`, `ThreadOptions` and `MemberUpdatePayload`. Every other model stays in `models/`
+  `PaginationParams` and `ThreadOptions`. Every other model stays in `models/`
   (`UserGroup`). No `request/` type exists yet: the first arrives when a group migrates one out of
   `lib/src/core/api/requests.dart`.
 - **Models and envelopes** are `@freezed` classes with a const constructor and `@override final` fields. Copy
@@ -344,10 +347,10 @@ Three data-shape traps while mapping:
 - **The model's `custom` is the wire's `custom`, verbatim** (README rule 9). A migrated model names it `custom`
   — `extraData` on one whose group has not run — and the mapper copies the generated map into it and sends it
   back as `custom`; never filter either. A typed wire field our model lacks is added as a field, with
-  approval, or left out — never parked in `extraData` behind a getter, as `ChannelModel.hidden` and `User.name`
-  still are until groups 11 and 09 promote them. A v1 decoder splits flat JSON by a key list — `topLevelFields`
-  while the model still has JSON, a private list beside the converter once it does not — and a v1 writer leaves a
-  custom entry named like a key out so it cannot overwrite the key.
+  approval, or left out — never parked in `extraData` behind a getter, as `User.name` still is until group 09
+  promotes it. A v1 decoder splits flat JSON by a key list — `topLevelFields` while the model still has JSON, a
+  private list beside the converter once it does not — and a v1 writer leaves a custom entry named like a key out
+  so it cannot overwrite the key.
 - **Units on anything that takes a `Duration`.** The wire carries a bare integer and the field name rarely says
   in what. Read the Go payload type: `commonpayloads.DurationInMinutes` and `DurationMilliseconds` sit on sibling
   endpoints in the same feature — `ban.timeout` and `mute.timeout` are minutes, `muteChannel.expiration` is

docs/docs_screenshots/test/message_search/message_search_list_view_test.dart

@@ -23,7 +23,7 @@ GetMessageResponse _makeSearchResult({
     ..channel = ChannelModel(
       id: 'ch-$messageId',
       type: 'messaging',
-      extraData: {'name': channelName},
+      custom: {'name': channelName},
     );
   return response;
 }

docs/docs_screenshots/test/src/mocks.dart

@@ -155,8 +155,8 @@ void setupMockChannel({
   when(() => channel.isMutedStream).thenAnswer((_) => Stream.value(false));
   when(() => channel.isPinned).thenReturn(false);
   when(() => channel.isPinnedStream).thenAnswer((_) => Stream.value(false));
-  when(() => channel.extraDataStream).thenAnswer((_) => Stream.value({'name': channelName}));
-  when(() => channel.extraData).thenReturn({'name': channelName});
+  when(() => channel.customStream).thenAnswer((_) => Stream.value({'name': channelName}));
+  when(() => channel.custom).thenReturn({'name': channelName});
   when(() => channel.name).thenReturn(channelName);
   when(() => channel.nameStream).thenAnswer((_) => Stream.value(channelName));
   when(() => channel.image).thenReturn(null);

docs/docs_screenshots/test/thread_list/thread_list_view_test.dart

@@ -41,7 +41,7 @@ Thread _makeThread({
     channel: ChannelModel(
       id: id,
       type: 'messaging',
-      extraData: {'name': channelName},
+      custom: {'name': channelName},
     ),
     parentMessage: parentMessage,
     latestReplies: [latestReply],