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gsxdsm e1dba3fcc9 FN-7113: validate workflow graph integrity before execution

Reject malformed workflow graphs at save and run boundaries.

- Add central IR validation for duplicate top-level node ids, unregistered extension keys, and unreachable required nodes.
- Re-validate resolved workflow IR in the graph runner before side effects and fail closed on invalid graphs.
- Expand graph integrity tests and document save/run validation behavior with a release changeset.

Files changed:
 .changeset/FN-7113-workflow-graph-integrity.md     |   7 +
 docs/custom-workflow-reliability-acceptance-map.md |   7 +-
 docs/workflow-steps.md                             |  20 +++
 .../workflow-ir-extension-metadata.test.ts         |  49 ++++++-
 packages/core/src/__tests__/workflow-ir.test.ts    | 106 +++++++++++++++-
 packages/core/src/workflow-ir.ts                   |  51 +++++++-
 .../__tests__/workflow-graph-task-runner.test.ts   | 141 +++++++++++++++++----
 packages/engine/src/workflow-graph-task-runner.ts  |  46 +++++--
 8 files changed, 386 insertions(+), 41 deletions(-)

Fusion-Task-Id: FN-7113

Fusion-Task-Lineage: f41e0d81-7cdf-497a-96ab-fe42504d0be4

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

2026-06-27 09:28:31 -07:00