fix(reborn): remove per-record lock convoys via shared cas_update helper#5234

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fix/reborn-p1-cas-helper

Commits on Jun 25, 2026

feat(filesystem): add shared cas_update read-modify-write helper

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refactor(resources): route CAS snapshot store through shared cas_update helper

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refactor(run_state): route CAS through shared cas_update; drop redundant per-record mutex

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refactor(threads): route ensure_thread through shared cas_update; drop per-record mutex

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refactor(secrets): route CAS through shared cas_update; delete per-record mutex (Arc leak fix)

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refactor(turns): re-home local CAS loop onto shared cas_update helper

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docs(filesystem): guardrail — RMW must use cas_update, never a per-record mutex

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fix(reborn): address CAS migration review feedback

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Merge origin/main into fix/reborn-p1-cas-helper

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