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* fix(workflows): fail fan-out loudly on a truthy non-mapping step template
A fan-out step whose `step:` is a truthy scalar or list (an authoring mistake) passed execute and reached the engine, which calls template.get("id", ...) in _run_fan_out — raising AttributeError and taking down the whole run. validate already rejects a non-mapping step, but the engine does not auto-validate, so an unvalidated run crashed.
Guard execute to FAIL the step (with a clear error and normalized empty output) instead, mirroring the existing non-list items guard and the switch non-dict cases guard. Add the matching test_execute_non_dict_step_fails_loudly covering the execute-path guard (validate was already covered).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* fix(workflows): reject explicit fan-out `step: null` in validate()
The runtime guard in execute() rejects a truthy non-mapping step, but
`config.get("step", {})` only substitutes the `{}` default for an *absent*
key — an explicit `step: null` reaches the guard as None and FAILS the step.
validate() previously exempted None (`step is not None and ...`), so such a
workflow passed validation and then failed during execution.
Align validate() with the runtime guard: a present-but-non-mapping `step`
(including `None`) is an authoring mistake and is now rejected up front.
Extend the validate and execute regression cases to cover None.
Addresses Copilot review feedback on #3537.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>