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gsxdsm 403bd9d716 FN-6582: enforce workflow gate artifact verdicts

Enforce custom workflow terminal gates for required artifacts and malformed pre-merge verdicts.

- Add runtime validation that declared workflow artifacts exist before reporting workflow success.
- Treat malformed pre-merge gate output as a blocking failure instead of a skipped success.
- Cover required-artifact and malformed-verdict gate behavior with focused engine tests.
- Document the required-artifact gate and add a patch changeset for the published CLI package.

Files changed:
 .changeset/fn-6582-workflow-gates.md               |   5 +
 docs/workflow-steps.md                             |   5 +-
 .../workflow-malformed-verdict-gate.test.ts        | 114 +++++++++++++++++++
 .../workflow-required-artifact-gate.test.ts        | 123 +++++++++++++++++++++
 packages/engine/src/executor.ts                    |  63 +++++++----
 packages/engine/src/workflow-task-runtime.ts       |  41 ++++++-
 6 files changed, 326 insertions(+), 25 deletions(-)

Fusion-Task-Id: FN-6582

Fusion-Task-Lineage: 6f59fc33-dd35-4e28-bf6b-85b709c77453

2026-06-17 14:52:56 -07:00