chore(release): 0.4.31.1 — Slack #138 + #95 fixes

[patrick-chinchill]

Cuts 0.4.31.1 — a Python-only patch on 4.31.0 (UPSTREAM_PARITY unchanged at 4.31.0) bundling the two merged Slack adapter fixes.

Included (already merged to main)

• Slack: empty DM thread_ts hits conversations.replies(ts='') in fetch paths — add conversations.history fallback #138 (PR fix(slack): route empty-DM thread_ts fetch to conversations.history (#138) #175) — empty-DM thread_ts fetch routes to conversations.history instead of conversations.replies(ts=''); non-empty path byte-identical.
• Slack: chat.startStream fails with team_not_found on Enterprise Grid workspaces #95 (PR fix(slack): thread team_id to chat.startStream for Enterprise Grid (#95) #176) — chat.startStream threads team_id (= recipient_team_id) for Enterprise Grid; verified end-to-end against slack_sdk that it reaches the API call.

This PR

• pyproject version 0.4.31 → 0.4.31.1; README status; CLAUDE.md version-mapping
• CHANGELOG 0.4.31.1 entry
• Docs: marked Linear "agent-sessions" mode experimental in LinearAdapterConfig (schema-hardened but unverified vs a live tenant, Port Linear agent sessions (adapter-linear) — deferred from 0.4.30 #151)

Validation (local)

ruff + format clean · audit 0 hard failures · pyrefly 0 · fidelity 732/732 --strict @ chat@4.31.0 · full suite green.

Next: deploy to customer-demo (git-ref) and live-verify #138 (DM fetch) + #95 (Grid stream) before the PyPI publish.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

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Run ID: 979aeebe-7fd4-4d92-971b-63a9bb06f3c6

📥 Commits

Reviewing files that changed from the base of the PR and between 707b657 and ddaf94d.

📒 Files selected for processing (5)

• CHANGELOG.md
• CLAUDE.md
• README.md
• pyproject.toml
• src/chat_sdk/adapters/linear/types.py

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Code Review

This pull request bumps the SDK version to 0.4.31.1, updating pyproject.toml, README.md, CLAUDE.md, and CHANGELOG.md. It documents Slack adapter bug fixes regarding empty-DM thread_ts fetch routing and Enterprise Grid team_id streaming, and adds a warning note in the Linear adapter configuration marking the 'agent-sessions' mode as experimental. There are no review comments, so no further feedback is provided.

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