## Summary

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## Verification

- [ ] Relevant tests run locally and noted in the PR.
- [ ] SEAM history/stream gates run when repository state changed materially.
- [ ] BIL-2 quickstart artifact produced when benchmark or external-memory code changed.
- [ ] No paid benchmark/API calls were made without explicit operator approval.
- [ ] No secrets, provider keys, private session URLs, or local `.env` values were added.

## Notes

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