Adds a dedicated DASHBOARD.md subsection covering what the q/status filter applies to on each page, why it's dashboard-side only, and the /overview layout constraint (stats panel outside the polled block, kept in sync via an out-of-band swap) so future layout changes don't reintroduce the polling-wipes-the-filter bug. Cross-links added from USAGE.md's queue-observation and registry sections. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>