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gsxdsm 90b62b7884 FN-7246: preserve explicit empty step dependencies

Preserve authored empty workflow step dependencies so parallel roots remain independent.

- Keep parser and TaskStep projections from dropping explicit empty dependsOn arrays.
- Treat missing dependsOn as the legacy previous-step fallback while allowing [] to mean no dependencies.
- Cover heading and JSON parsers plus parallel foreach scheduling with regression tests and docs.

Files changed:
 .changeset/fn-7246-workflow-depends-on-empty.md              |  7 +++++++
 docs/workflow-steps.md                                       |  4 ++--
 packages/core/src/__tests__/step-parsers.test.ts             |  8 ++++----
 packages/core/src/step-parsers.ts                            | 30 +++++++++++++++++++++---------
 packages/core/src/types.ts                                   | 13 +++++++++----
 packages/engine/src/__tests__/workflow-parse-steps.test.ts   | 12 ++++++++++++
 packages/engine/src/__tests__/workflow-step-parallel.test.ts | 30 +++++++++++++++++++++++++++++-
 packages/engine/src/workflow-graph-foreach.ts                |  9 +++++++--
 packages/engine/src/workflow-node-handlers.ts                |  6 +++++-
 9 files changed, 96 insertions(+), 23 deletions(-)

Fusion-Task-Id: FN-7246

Fusion-Task-Lineage: a75687fa-5711-4509-b60f-43669323a6c0

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

2026-06-29 18:05:44 -07:00