chore(main): release 0.8.1

[github-actions]

🤖 I have created a release beep boop

0.8.1 (2026-08-26)

Bug Fixes

• lockutil: use kernel-held advisory locks (#950) (6fe0d1e)
• sandbox: Make WSL backend tests deterministic. (#948) (e59bf78)
• sandbox: refcount temporary roots so one holder's cleanup cannot revoke another's (#911) (7acac7a)
• tools: an edit keeps the reads it did not disturb (#908) (1649008)
• tools: make apply_patch tolerant and re-expose edit_file (#956) (2749447)

Performance Improvements

• agent: cheap compaction — dedicated summarizer model, input cap… (#532) (6645f97)
• reduce startup and turn overhead (#932) (1fde941)

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