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gsxdsm e48df026c6 FN-6594: classify Codex transcript desync as non-continuable

Recognize Codex transcript replay desync failures so completed tasks can recover instead of wedging.

- Add Codex transcript-desync matching to non-continuable session error detection.
- Cover canonical and symmetric missing function-call-output messages while excluding auth, quota, and ordinary bad-input errors.
- Add self-healing coverage for post-done wedges with Codex envelope and log evidence.

Files changed:
 .../post-done-continuation-no-wedge.test.ts        | 72 ++++++++++++++++++++++
 .../src/__tests__/transient-error-detector.test.ts | 24 +++++++-
 packages/engine/src/transient-error-detector.ts    |  7 ++-
 3 files changed, 101 insertions(+), 2 deletions(-)

Fusion-Task-Id: FN-6594

Fusion-Task-Lineage: 517f39c8-9bbb-47d2-a4a4-495eaf8c3fca

2026-06-17 15:11:55 -07:00