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gsxdsm 320b153c45 FN-6113: fail fast on terminal provider errors

Fail fast on non-retryable provider failures in the in-review stall recovery flow.

- classify failed-task provider errors as non-retryable, retryable, or unknown in core stall detection
- surface terminal provider errors with dedicated dashboard copy and exported stall signal metadata
- pause in-review tasks immediately on non-retryable provider failures and record a dedicated run-audit mutation
- add regression coverage for provider error classification, self-healing disposition, and dashboard badge behavior

Files changed:
 .../core/src/__tests__/in-review-stall.test.ts     |  70 ++++++++++
 packages/core/src/in-review-stall.ts               |  53 ++++++-
 packages/core/src/index.ts                         |   4 +-
 .../app/utils/__tests__/inReviewStallCopy.test.ts  |   5 +-
 packages/dashboard/app/utils/inReviewStallCopy.ts  |   8 ++
 .../in-review-stall-deadlock-disposition.test.ts   | 153 +++++++++++++++++++++
 packages/engine/src/run-audit.ts                   |   1 +
 packages/engine/src/self-healing.ts                |  30 +++-
 8 files changed, 320 insertions(+), 4 deletions(-)

Fusion-Task-Id: FN-6113

Fusion-Task-Lineage: 5e89adb4-6b59-4deb-8811-5c75d6fa19cc

2026-06-09 12:51:20 -07:00