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gsxdsm ae512aec2b FN-8601: enforce foreach merge proof

Require complete foreach execution evidence before workflow merge review.

- Add reusable foreach instance coverage proof evaluation.
- Block checklist projection and merge admission on incomplete or failed node results.
- Cover core proof logic and PostgreSQL merge-boundary behavior.
- Add a patch changeset for the merge safeguard.

Files changed:
 .changeset/fn-8601-foreach-merge-proof.md          |   7 ++
 .../src/__tests__/workflow-merge-proof.test.ts     |  43 ++++++++
 packages/core/src/index.gate.ts                    |   2 +
 packages/core/src/index.ts                         |   2 +
 packages/core/src/workflow-merge-proof.ts          |  74 +++++++++++++
 ...xecutor-merge-boundary-foreach-proof.pg.test.ts | 111 +++++++++++++++++++
 packages/engine/src/executor.ts                    | 117 +++++++++++++--------
 7 files changed, 314 insertions(+), 42 deletions(-)

Fusion-Task-Id: FN-8601

Fusion-Task-Lineage: 40578171-0b13-4538-8f38-3948ed1e92c0

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

2026-07-26 09:40:37 -07:00