Merge dev to main#1359
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The visibility-poll added in commit fad4dda throws "Linear description visibility timed out for issue X after 1000ms" whenever Linear's read replica is slower than 1s — which is routine under load. Three planning runs failed back-to-back on prod (2026-05-12) on this signal: MNG-741 run 44c1bc3f 11m "no PM write recorded" (visibility throw propagated up; CLI exited; sidecar never written; gate failed) MNG-736 run 98ae7010 13m same MNG-739 run 1534ab74 16m same The 1s wait was always advisory — it only guarded against in-process consecutive `updateDescription` calls reading a stale GET between PUTs. The new contract removes the wait entirely and adds an in-process recent-description cache (60s TTL, keyed on issueId). After each successful PUT, the cache stores the new description. The next `updateDescription` call consults the cache before mutating — if GET returned a stale pre-PUT value (Linear's eventual-consistency window), the cached fresh value wins. This gives the same in-process read-after-write guarantee the wait was supposed to provide, without throwing on slow Linear days. The wait never solved cross-process consistency (the existing withDescriptionMutationLock is process-local too); the cache doesn't either, but that scope was never claimed. TDD test pins the worst case: Linear GET continues to return the stale pre-PUT description forever; createChecklist + addChecklistItem must still produce a correct PUT containing the appended item via the cache. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Cascade Bot <bot@cascade.dev>
…tion-visibility-advisory fix(linear): replace visibility-poll with in-process cache (MNG-741)
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Routine dev → main promotion.
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