* fix(bpmn): let the graph hash alone decide BPMN source staleness
A metadata-only save (a rename, a variable edit) bumps a published definition
to a new draft version without touching the graph, but the stale check
compared the version unconditionally, refusing export/document GET even
though the graph the stored source describes had not moved. Once the
graph-hash marker is present it now decides staleness on its own; the version
check remains only as a fallback for definitions imported before that marker
existed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
* test(bpmn): share the simulated-publish helper
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
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