* async
* add test
* test(threads): assert aput preserves endpoint-assigned checkpoint id
Confirm the update_thread_state fix is real, not a no-op: all supported
savers (InMemorySaver, AsyncSqliteSaver, AsyncPostgresSaver) persist and
echo checkpoint["id"] verbatim rather than minting their own. Add
assertions that each POST /state response's checkpoint_id round-tripped
into persisted history and kept its uuid6 time-ordering through aput,
and document the verified contract in the router.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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