feat(core): loop iteration via .step() with each:#83

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ben-rogerson wants to merge 17 commits intomainfrom

feat/workflow-iteration

Commits on May 4, 2026

feat(core): add EachSource materialiser for loop iteration
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chore(core): polish source materialiser (rename + import + cast)
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feat(core): bind loop items to sub-workflow params
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chore(core): tighten loop item binding (undefined + hasOwn)
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feat(core): add loop manifest schema and writer
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chore(core): harden loop manifest path + add failed-item test
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feat(core): add LoopWorkflowStep schema and isLoopStep helper
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chore(core): dedupe EachSource + tighten loop schema tests
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feat(core): .step() accepts WorkflowDef for loop iteration
ben-rogerson
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chore(core): tighten loop step builder (onItemFail guard + pass-through tests)
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feat(core): loop runner orchestrates iterated sub-workflows
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chore(core): tighten loop runner (halt-first + onItemFail diagnostics)
ben-rogerson
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feat(core): engine dispatches loop steps to runLoopStep
ben-rogerson
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