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gsxdsm a014c6d42d FN-5697: retry transient auto-merge failures and fix migration versioning

Treat transient auto-merge/provider abort errors as bounded retries while preserving correct schema migration ordering.

- Add transient merge retry handling with capped exponential backoff, queue re-enqueue, and exhaustion logging before failing tasks.
- Extend task/core types and evaluator evidence plumbing for merge transient retry tracking and MergeTransientRetryExhausted visibility.
- Add regression coverage for transient auto-merge retries and exhaustion behavior in merge error recovery tests.
- Resolve migration collision by promoting workflow_steps.gateMode migration to version 77, shifting subsequent migrations, and bumping schema version to 95.
- Add a changeset and architecture note documenting transient retry behavior.

Files changed:
 .changeset/fn-5697-auto-merge-transient-retry.md   |  5 ++
 docs/architecture.md                               |  1 +
 packages/core/src/db.ts                            | 85 +++++++++++----------
 packages/core/src/eval-types.ts                    |  1 +
 packages/core/src/store.ts                         | 19 +++--
 packages/core/src/types.ts                         |  7 ++
 packages/engine/src/__tests__/evaluator-evidence.test.ts       |  1 +
 packages/engine/src/__tests__/merge-error-recovery.test.ts     | 87 ++++++++++++++++++++++
 packages/engine/src/evaluator-evidence.ts          |  1 +
 packages/engine/src/project-engine.ts              | 68 +++++++++++++++++
 10 files changed, 231 insertions(+), 44 deletions(-)

Fusion-Task-Id: FN-5697

Fusion-Task-Lineage: c8be7374-7cb6-444e-9920-9227e05a43dc

2026-05-29 10:23:59 -07:00