chore: release 0.4.26.2

[patrick-chinchill]

Summary

Ships 0.4.26.2 — a parity catch-up release for upstream chat@4.26.0. Bundles 8 merged PRs (#64, #65, #66, #67, #73, #74, #75, #76) plus small followup cleanups surfaced in post-merge review.

In this PR

• pyproject.toml: 0.4.26.1 → 0.4.26.2
• CHANGELOG.md: ## Unreleased → ## 0.4.26.2 (2026-04-24); dropped a stray leftover merge-conflict marker; corrected StreamingPlan.update_task typo to Plan.update_task (StreamingPlan doesn't implement it)
• tests/test_thread_faithful.py: TestPostWithPlan docstring said the 3 Plan divergences (UpdateTaskInput.id / error propagation / FIFO ordering) were "unsupported/skipped" — they were actually fixed in test(plan): port 19 [post with Plan] tests (#55) #75. Rewrote the docstring.
• src/chat_sdk/adapters/slack/adapter.py: kept asyncio.ensure_future with an inline comment explaining why — create_task fails pyrefly because the ChatInstance Protocol types process_options_load as Awaitable, not Coroutine.

Release highlights

• Thread.get_participants() (Port Thread.getParticipants() method #54) — upstream-parity port
• onOptionsLoad + Slack block_suggestion (Port onOptionsLoad handler for dynamic select dropdown population #50) — external-select dispatch
• rehydrateAttachment hook + SSRF guards (Port rehydrate_attachment to Adapter protocol + _rehydrate_message #52) — 5-adapter implementations with per-adapter URL allowlists
• StreamingPlan + options (Port 6 missing StreamingPlan option tests to test_thread_faithful.py #56) — adds kind=='stream' branch (options were silently dropped)
• IoRedisStateAdapter (State adapters: add ioredis-compatible lock token prefix for cross-runtime Redis sharing #71) — TS/Python Redis interop
• Teams cert config shape (Teams adapter: port certificate-based mTLS authentication #58) — parity with upstream's deprecated-throws stub
• 20 [post with Plan] + 6 [Streaming] test ports (Port 20 missing [post with Plan] tests to test_thread_faithful.py #55, Port 6 missing StreamingPlan option tests to test_thread_faithful.py #56) + 3 Plan divergence fixes
• Async time.sleep hygiene sweep across 3 state test files

Fidelity: all [getParticipants] / [thread] / [Options Load] / [post with Plan] / [Streaming] / [concurrency: queue attachment rehydration] gaps closed.

Test plan

• uv run ruff check src/ tests/ scripts/ — clean
• uv run ruff format --check src/ tests/ scripts/ — clean
• uv run pyrefly check — 0 errors
• uv run python scripts/audit_test_quality.py — 0 hard failures
• uv run pytest tests/ -q — 3631 passed, 2 skipped

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 77d67216-08a5-4c65-bfbe-1aa6693dbf18

📥 Commits

Reviewing files that changed from the base of the PR and between 57de87f and e337f03.

📒 Files selected for processing (4)

• CHANGELOG.md
• pyproject.toml
• src/chat_sdk/adapters/slack/adapter.py
• tests/test_thread_faithful.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/0.4.26.2

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[gemini-code-assist]

Code Review

This pull request updates the SDK to version 0.4.26.2, incorporating several fixes to align with the upstream TypeScript implementation. Key changes include enabling Plan.update_task to honor input.id, ensuring adapter.edit_object errors are correctly propagated, and resolving concurrency issues in the plan edit queue. The Slack adapter was also updated with explanatory comments regarding task creation, and test documentation was refreshed to reflect these improvements. I have no feedback to provide.