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gsxdsm e42679daff FN-7173: preserve stuck triage drafts on requeue

Stuck triage retries now continue from saved planning drafts instead of restarting.

- Detect non-empty PROMPT.md drafts or saved plan task documents after stuck-detector aborts.
- Requeue draft-backed stuck triage runs as replans with explicit resume feedback and bounded retry escalation.
- Cover prompt-vs-plan recovery, cold retries, approval recovery, and exhaustion behavior in engine tests.
- Document the stuck-triage preservation invariant and add a patch changeset.

Files changed:
 ...-7173-preserve-triage-draft-on-stuck-requeue.md |   7 +
 docs/architecture.md                               |   6 +-
 .../triage-stuck-requeue-preserve-draft.test.ts    | 348 +++++++++++++++++++++
 packages/engine/src/__tests__/triage.test.ts       |   2 +-
 packages/engine/src/triage.ts                      | 153 ++++++++-
 5 files changed, 499 insertions(+), 17 deletions(-)

Fusion-Task-Id: FN-7173
Fusion-Task-Lineage: 8e59b025-92cc-4902-bf88-b203b65c2c7d
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-06-27 23:18:28 -07:00