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gsxdsm b6b5583f01 FN-7039: apply execution-lane models to workflow steps

Route workflow and automation prompt steps through the execution-lane model hierarchy.

- Use executor session model resolution for task workflow prompt steps while preserving per-step overrides.
- Use execution settings model resolution for scheduled and manual AI-prompt automation runs.
- Document the model precedence and add regression coverage plus a patch changeset.

Files changed:
 .changeset/fn-7039-workflow-execution-model.md     |   7 +
 docs/settings-reference.md                         |   2 +
 .../core/src/__tests__/model-resolution.test.ts    |  12 ++
 packages/dashboard/src/routes.ts                   |   6 +-
 .../engine/src/__tests__/executor-test-helpers.ts  |  11 +-
 .../__tests__/executor-workflow-step-model.test.ts | 234 +++++++++++++++++++++
 packages/engine/src/cron-runner.ts                 |   7 +-
 packages/engine/src/executor.ts                    |  23 +-
 8 files changed, 285 insertions(+), 17 deletions(-)

Fusion-Task-Id: FN-7039

Fusion-Task-Lineage: f27c4be8-7793-4212-b9ee-679f50193406

2026-06-25 21:05:33 -07:00