## Summary
- Adds `extract` parameter to `threads.search()` in both async and sync
clients
- Adds `extracted` field to the `Thread` TypedDict response type
- The `extract` parameter accepts a `dict[str, str]` mapping aliases to
JSONB paths (e.g., `{"last_msg": "values.messages[-1]"}`)
- Depends on server-side support in
https://github.com/langchain-ai/langgraph-api/pull/2609
## Test plan
- [ ] Verify types are correct via lint/format (already passing)
- [ ] Integration test against server with extract feature enabled
Release Notes: Add `extract` parameter to `threads.search()` for
extracting nested values from thread data during search.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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- Make sure optional dependencies are imported within a function.
- Please do not add dependencies to `pyproject.toml` files (even
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
