Artifact: HEART Goals-Signals-Metrics — Kestrel Task Success

A HEART Task-Success row for Kestrel's core scheduling flow -- exercises co-19. Kestrel is a fictional product; every quoted number, question, or finding here is an illustrative, constructed example, not real data or a real transcript.

Element	Content
Goal	Managers can publish a correct, conflict-free weekly schedule quickly.
Signal	A manager completes a schedule-publish attempt without hitting a validation error (a detected double-booking or an under-staffed shift) and without abandoning the draft partway through.
Metric	% of schedule-publish attempts that succeed on the first try; median time from opening a draft to publishing it.