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gsxdsm 72623ec804 FN-8837: fix pull-request merge retry recovery

Make pull-request merge failures retry safely and report actionable terminal states.

- Persist exponential retry backoff and schedule durable retry wakeups.
- Classify policy, transient, and non-retryable GitHub merge failures correctly.
- Clear retry state on successful merges and cover notifications and recovery paths.

Files changed:
 .changeset/fn-8837-pr-merge-retries.md             |   7 +
 docs/architecture.md                               |   1 +
 .../task-update-awaiting-approval-reason.test.ts   |   9 +
 packages/core/src/store.ts                         |   2 +-
 packages/core/src/task-store/task-update.ts        |   6 +-
 packages/core/src/types/task/task-core.ts          |   7 +-
 .../src/__tests__/merge-error-recovery.test.ts     | 440 ++++++++++++++++++++-
 .../engine/src/__tests__/ntfy-provider.test.ts     |  14 +
 .../engine/src/__tests__/webhook-provider.test.ts  |  15 +
 .../__tests__/notification-service.test.ts         |  48 +++
 .../src/notification/notification-service.ts       |  15 +-
 packages/engine/src/notification/ntfy-provider.ts  |  15 +-
 .../engine/src/notification/webhook-provider.ts    |   9 +-
 packages/engine/src/project-engine.ts              | 240 +++++++++--
 14 files changed, 781 insertions(+), 47 deletions(-)

Fusion-Task-Id: FN-8837

Fusion-Task-Lineage: a39b3491-d5cb-4509-b450-3e5671e0ba2d

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-08 22:43:45 -07:00