FetchPolecats() was showing all tmux sessions system-wide without filtering by the workspace's registered rigs. This caused unrelated refineries (like roxas) to appear in the dashboard. Now loads rigs.json and only displays sessions for registered rigs, matching the filtering behavior already used in FetchMergeQueue(). Fixes gh-868 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>