Store 3's read side already existed but gated on `produces execution_plan`, so the
one stage #305 is actually about — discovery — still started cold. The gate now keys
on the produced artifact kind being a plan-shape consumer (execution_plan OR
discovery), with a discovery-specific framing: the prior run's stage list read as a
checklist of surfaces this task-family touches, to inspect now rather than at stage 6.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
kami
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