feat: add message/channel paginator stack with thread minimal-init and state stores

specs/message-paginator-release-compat/breaking-change-summary.md

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+# Breaking-Change Summary (`master`...`feat/message-paginator`)
+
+## Highest-Risk Changes
+
+1. **`BasePaginator` API contract changed behind same public export name**
+
+- Old API shape (`next/prev`, `hasNext/hasPrev`, `cursor.next/prev`, direction `next|prev`) was replaced by (`toHead/toTail`, `hasMoreHead/hasMoreTail`, `cursor.headward/tailward`, direction `headward|tailward`).
+- This can break downstream subclasses and direct usages.
+
+2. **Moved paginator source files can break unsupported deep-import paths (out of scope)**
+
+- Files moved from `src/pagination/*` to `src/pagination/paginators/*`.
+- Root exports remain available via `src/index.ts -> export * from './pagination'`.
+- Risk exists only for consumers importing internal paths such as `stream-chat/src/pagination/BasePaginator`.
+- This is out of scope for this compatibility pass because the supported interface is root exports.
+
+3. **`MessageReceiptsTracker` constructor options changed (mostly internal/pseudo-break)**
+
+- Old usage expected `{ locateMessage }`; new usage requires `{ channel, locateMessage? }`.
+- Existing direct instantiation can break, but expected impact is low because this class is primarily used internally by `Channel`.
+
+## Medium-Risk Changes
+
+4. **Setup-related type exports moved out of `client.ts`**
+
+- `MessageComposerSetupState` and related setup types were exported previously from `client.ts` and now live in `configuration/types.ts`.
+- This is resolved if root `index.ts` re-exports `./configuration`.
+
+5. **`StreamChat._messageComposerSetupState` removed (internal-only)**
+
+- This is internal API and not part of supported semver surface.
+
+## Suggested Release Classification
+
+- If compatibility shims/re-exports are **not** added: treat as **major**.
+- If shims/re-exports are added and `BasePaginator` compatibility is preserved/aliased: could remain **minor**.

specs/message-paginator-release-compat/compatibility-report.release-v13.md

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+# Compatibility Report: `stream-chat-react@release-v13` vs local `stream-chat-js@feat/message-paginator`
+
+## Environment
+
+- React worktree: `/Users/martincupela/Projects/stream/chat/stream-chat-react-worktrees/chatview-layout-controller`
+- React branch: `release-v13`
+- JS SDK repo: `/Users/martincupela/Projects/stream/chat/stream-chat-js`
+- JS branch: `feat/message-paginator`
+
+## Dependency wiring
+
+`stream-chat-react` resolved `stream-chat` through existing yarn-link symlink:
+
+- `node_modules/stream-chat -> /Users/martincupela/.config/yarn/link/stream-chat`
+- `/Users/martincupela/.config/yarn/link/stream-chat -> /Users/martincupela/Projects/stream/chat/stream-chat-js`
+
+So test runs consumed local SDK code from this branch.
+
+## Commands run
+
+1. Build / type readiness on JS SDK side (already validated in prior steps):
+
+- `yarn build` (in `stream-chat-js`)
+
+2. Targeted release-v13 compatibility tests (React worktree):
+
+- `yarn test --watchman=false src/components/Channel/__tests__/Channel.test.js src/components/MessageList/__tests__/MessageList.test.js src/components/Thread/__tests__/Thread.test.js`
+
+3. Typecheck in React worktree:
+
+- `yarn types`
+
+4. Full React test matrix:
+
+- `yarn test --watchman=false`
+
+5. Reproduction of initially failing suites only:
+
+- `yarn test --watchman=false src/components/MessageInput/__tests__/ThreadMessageInput.test.js src/components/Poll/__tests__/PollCreationDialog.test.js`
+
+6. Full React test matrix after test updates:
+
+- `yarn test --watchman=false`
+
+## Results
+
+- Targeted test suites: **PASS**
+  - `Channel.test.js`: pass
+  - `MessageList.test.js`: pass
+  - `Thread.test.js`: pass
+  - Total: 3 suites, 133 tests passed
+- React typecheck: **PASS**
+- Full suite (final): **PASS**
+  - `139 passed, 0 failed`
+  - `2024 passed tests, 2 skipped`
+
+## Observations
+
+- `--watchman=false` was required due to sandbox watchman permission errors; this is environment-related, not product behavior.
+- There were pre-existing console warnings in tests (`MessageTimestamp ... invalid created_at date`, React `act(...)` warnings), but no assertion failures.
+
+## Compatibility conclusion (targeted)
+
+For the validated `release-v13` compatibility surfaces, no breaking regressions were detected when using local `stream-chat-js@feat/message-paginator`:
+
+- Legacy channel pagination usage (`channel.state.messagePagination` / `messageSets`) continues to work in tested flows.
+- mark-read / `doMarkReadRequest`-related Channel and MessageList flows pass.
+- Thread flows in tested suite pass.
+
+## Full-suite findings and resolution
+
+1. `ThreadMessageInput` draft test triggered unexpected network delete request
+
+- Failing test:
+  - `src/components/MessageInput/__tests__/ThreadMessageInput.test.js`
+- case: `draft › is queried when drafts are enabled`
+- Error:
+  - `AxiosError: Network Error` from `Channel._deleteDraft` via `MessageComposer.deleteDraft`.
+- Resolution:
+  - mocked `customChannel._deleteDraft` in test setup to avoid external HTTP in test env.
+
+2. Poll max-vote validation behavior changed (value clamping)
+
+- Failing test:
+  - `src/components/Poll/__tests__/PollCreationDialog.test.js`
+- case updated to `clamps max vote count to 10 and allows submission`
+- Resolution:
+  - adjusted assertions to new behavior:
+    - error text is empty
+    - value is clamped to `10`
+    - submit button is enabled
+  - no translation updates required (`i18n/en.json` already contains the previous key).
+
+## Remaining risk
+
+- Full Jest matrix is green for this setup; no blocking compatibility failures remain.

specs/message-paginator-release-compat/decisions.md

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+# Message Paginator Release Compatibility Decisions
+
+## Decision: Treat BasePaginator API drift as the primary release risk
+
+**Date:** 2026-03-05
+**Context:**
+`BasePaginator` remains publicly exported but its method names, direction values, cursor shape, and state fields changed.
+
+**Decision:**
+Prioritize compatibility strategy for `BasePaginator` before merging branch to `master`.
+
+**Reasoning:**
+This is the most likely downstream compile/runtime break for advanced integrators that extend paginator classes.
+
+**Alternatives considered:**
+
+- Ignore and treat as internal-only: rejected because `BasePaginator` is exported.
+- Delay until post-merge: rejected because release classification would be unclear.
+
+## Decision: Compatibility scope is root exports from `src/index.ts` only
+
+**Date:** 2026-03-05
+**Context:**
+The release compatibility target is the public package API exposed through root exports.
+
+**Decision:**
+Do not add deep-import compatibility shims for moved paginator files.
+Compatibility work is limited to symbols exported via `src/index.ts`.
+
+**Reasoning:**
+Deep imports are not the supported interface contract for this release.
+Focusing on root exports keeps the compatibility scope explicit and maintainable.
+
+**Alternatives considered:**
+
+- Add shims for old deep-import file paths: rejected as out-of-scope for public API compatibility.
+
+## Decision: Restore removed setup type exports on root surface
+
+**Date:** 2026-03-05
+**Context:**
+`MessageComposerSetupState` moved into configuration internals and is no longer exported from root API.
+
+**Decision:**
+Plan includes restoring root exports (directly or via re-export) to avoid unintended TypeScript breakage.
+
+**Reasoning:**
+Type-only breaks still impact consumers and should be avoided in non-major release.
+
+## Decision: Add transitional BasePaginator compatibility aliases
+
+**Date:** 2026-03-05
+**Context:**
+`BasePaginator` introduced head/tail naming (`toTail`, `toHead`, `hasMoreTail`, `hasMoreHead`, `tailward/headward` cursors), while older consumers may still call legacy APIs.
+
+**Decision:**
+Add deprecated alias APIs on `BasePaginator`:
+
+- methods: `next`, `prev`, `nextDebounced`, `prevDebounced`
+- getters: `hasNext`, `hasPrev`
+- query response compatibility: accept `next/prev` cursor fields as fallback to `tailward/headward`.
+
+**Reasoning:**
+This preserves backward compatibility for non-migrated paginator consumers while keeping new naming as canonical.

specs/message-paginator-release-compat/plan.md

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+# Message Paginator Release Compatibility Plan
+
+## Worktree
+
+**Worktree path:** `/Users/martincupela/Projects/stream/chat/stream-chat-js`
+**Branch:** `feat/message-paginator`
+**Base branch:** `master`
+
+## Task overview
+
+Scope is limited to the public interface exported via `src/index.ts`.
+Deep-import path compatibility is explicitly out of scope.
+
+## Task 1: Confirm Public Interface Scope
+
+**File(s) to create/modify:** `specs/message-paginator-release-compat/decisions.md`, `specs/message-paginator-release-compat/spec.md`
+
+**Dependencies:** None
+
+**Status:** done
+
+**Owner:** codex
+
+**Scope:**
+
+- Lock compatibility target to root exports from `src/index.ts`.
+- Mark deep-import path stability as non-goal.
+
+**Acceptance Criteria:**
+
+- [x] Scope decision is documented.
+- [x] Breaking-change summary reflects this scope.
+
+## Task 2: Restore Root Export Coverage for Configuration Types
+
+**File(s) to create/modify:** `src/index.ts`, `test/typescript/unit-test.ts`
+
+**Dependencies:** Task 1
+
+**Status:** done
+
+**Owner:** codex
+
+**Scope:**
+
+- Ensure configuration setup types are root-exported (`export * from './configuration'`).
+- Add a type-level regression check for configuration setup types.
+
+**Acceptance Criteria:**
+
+- [x] Root index exports configuration module.
+- [x] Type-level regression check compiles.
+
+## Task 3: Add Legacy BasePaginator API Aliases
+
+**File(s) to create/modify:** `src/pagination/paginators/BasePaginator.ts`
+
+**Dependencies:** Task 1
+
+**Status:** done
+
+**Owner:** codex
+
+**Scope:**
+
+- Add compatibility aliases:
+  - `next`/`prev`
+  - `nextDebounced`/`prevDebounced`
+  - `hasNext`/`hasPrev`
+- Support legacy `next/prev` cursor fields in query result fallback.
+
+**Acceptance Criteria:**
+
+- [x] Existing legacy paginator call sites compile and run via aliases.
+- [x] New API remains primary and unchanged.
+- [x] Aliases are documented as transitional compatibility layer.
+
+## Task 4: Add Regression Tests for Alias Compatibility
+
+**File(s) to create/modify:** `test/unit/pagination/paginators/BasePaginator.test.ts`
+
+**Dependencies:** Task 3
+
+**Status:** done
+
+**Owner:** codex
+
+**Scope:**
+
+- Add tests for legacy method/getter aliases.
+- Add test for `next/prev` cursor field fallback.
+
+**Acceptance Criteria:**
+
+- [x] Alias tests pass.
+- [x] Existing paginator tests stay green.
+
+## Task 5: Final Release Notes and Compatibility Summary
+
+**File(s) to create/modify:** `specs/message-paginator-release-compat/spec.md`, `specs/message-paginator-release-compat/decisions.md`, `specs/message-paginator-release-compat/breaking-change-summary.md`
+
+**Dependencies:** Task 2, Task 4
+
+**Status:** done
+
+**Owner:** codex
+
+**Scope:**
+
+- Finalize real vs pseudo breaking changes for public root API.
+- Document deprecations and migration notes.
+
+**Acceptance Criteria:**
+
+- [x] Summary is aligned with public root export scope.
+- [x] Remaining intentional breaks are explicitly listed.
+
+## Task 6: Cross-Repo `release-v13` Compatibility Validation
+
+**File(s) to create/modify:** `specs/message-paginator-release-compat/compatibility-report.release-v13.md`
+
+**Dependencies:** Task 2, Task 4
+
+**Status:** done
+
+**Owner:** codex
+
+**Scope:**
+
+- Use `stream-chat-react` worktree at `/Users/martincupela/Projects/stream/chat/stream-chat-react-worktrees/chatview-layout-controller` (`release-v13` branch).
+- Run tests against local `stream-chat-js` branch build (`feat/message-paginator`) by wiring React worktree dependency to local SDK.
+- Focus on legacy compatibility surfaces:
+  - `channel.state.messagePagination` and `messageSets` behavior used by `release-v13`.
+  - mark-read and `doMarkReadRequest` flows.
+  - paginator compatibility behavior where relevant.
+- Record exact commands, results, and failures.
+
+**Acceptance Criteria:**
+
+- [x] Targeted `release-v13` tests for Channel/MessageList/Thread run against local JS SDK.
+- [x] Any failures are categorized as real break, expected behavior shift, or test issue.
+- [x] Compatibility report is committed to specs folder.
+
+## Execution order
+
+- **Phase 1 (serial):** Task 1
+- **Phase 2 (parallel):** Task 2, Task 3
+- **Phase 3 (serial):** Task 4
+- **Phase 4 (serial):** Task 5
+- **Phase 5 (serial):** Task 6
+
+## File ownership summary
+
+| Task   | Creates/Modifies                                                                                                                                                             |
+| ------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Task 1 | `specs/message-paginator-release-compat/decisions.md`, `specs/message-paginator-release-compat/spec.md`                                                                      |
+| Task 2 | `src/index.ts`, `test/typescript/unit-test.ts`                                                                                                                               |
+| Task 3 | `src/pagination/paginators/BasePaginator.ts`                                                                                                                                 |
+| Task 4 | `test/unit/pagination/paginators/BasePaginator.test.ts`                                                                                                                      |
+| Task 5 | `specs/message-paginator-release-compat/spec.md`, `specs/message-paginator-release-compat/decisions.md`, `specs/message-paginator-release-compat/breaking-change-summary.md` |
+| Task 6 | `specs/message-paginator-release-compat/compatibility-report.release-v13.md`                                                                                                 |