Ali jawwad 220e6fcc4e fix(workflows): fan-in validate() rejects non-mapping output (#3349) ...

FanInStep.validate() only checked wait_for, so a non-mapping 'output'
(a list or scalar) validated clean; execute() then silently coerces it
to {}, so the author's declared aggregation keys vanish with COMPLETED
status and no diagnostic. Reject a non-mapping output at validation,
mirroring the command-step (#3262) non-mapping fix. execute()'s
defensive coercion is left in place for unvalidated callers.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

2026-07-07 14:49:29 -05:00

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