Final Codex (gpt-6.1-sol, xhigh) pass over c65982f confirmed every
earlier item fixed and found:
- high: readers skipped the lock on any error, so a lock file owned by
another user (who can still sync) let a reader run unlocked. Readers
now open an existing lock file read-only for the shared lock, and read
unlocked only when no lock file exists and none can be created.
- low: sync resolved the symlinked path for the install target and the
lock separately; it now resolves once and passes that path to the
lock callback, so both always name the same database.
Verified live: a reader with a read-only lock file waits for an
exclusive holder; install waits for readers; a symlinked path keeps its
link. CLI goldens unchanged; live A/B vs 0.2.4: 15 passed, screen hit a
transient MSN 408 on the old build only (retries pass), discover hits
the IDX 403 on both (exit 4 vs 1, intended).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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