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gsxdsm 7b55a02e51 FN-9157: fix workflow merge boundary proof and retry routing

Make workflow merge admission accept valid foreach completion and terminate retries when proof is unavailable.

- Treat fully terminal live foreach steps as implementation proof for Review Level 0 workflows.
- Preserve merge-boundary-unproven as a terminal graph failure and park blocked retries visibly.
- Add unit, graph-boundary, and PostgreSQL regression coverage plus operator documentation and a patch changeset.

Files changed:
 .changeset/fn-9157-merge-boundary.md               |  7 +++
 docs/architecture.md                               |  4 ++
 docs/workflow-steps.md                             |  6 ++
 .../src/__tests__/workflow-merge-proof.test.ts     | 11 +++-
 packages/core/src/workflow-merge-proof.ts          | 20 +++++--
 .../src/__tests__/executor-graph-boundary.test.ts  | 64 +++++++++++++++++++++-
 ...xecutor-merge-boundary-foreach-proof.pg.test.ts | 10 ++++
 .../__tests__/merge-boundary-unproven-park.test.ts | 48 ++++++++++++++++
 .../create-authoritative-workflow-primitives.ts    | 13 ++++-
 .../create-authoritative-workflow-seams.ts         |  6 +-
 .../executor/evaluate-workflow-merge-boundary.ts   | 18 +++++-
 .../executor/route-graph-merge-failure-to-retry.ts | 26 ++++++++-
 packages/engine/src/executor/task-predicates.ts    |  2 +
 .../engine/src/executor/workflow-merge-boundary.ts | 29 +++++++---
 .../engine/src/workflows/workflow-merge-nodes.ts   | 13 +++++
 15 files changed, 253 insertions(+), 24 deletions(-)

Fusion-Task-Id: FN-9157

Fusion-Task-Lineage: 7c68dfe2-28fb-4353-9ae6-df0ddbaf799a

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

2026-08-19 18:16:49 -07:00