Move QA-complete tasks to release preparation queue now

QA-complete comments can leave tasks in development, causing release handoffs to be missed. Move them to the release preparation section so coordinators see ready work same day.

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Overview

When QA comments don't translate into action, release planning stalls and engineers spend time hunting ready work. This flow routes QA-complete tasks into the release preparation section so coordinators see launch-ready items same day and manual triage is removed.