The convoy dashboard last_activity column was showing "no activity" because
the old code looked for agent records in beads databases at wrong paths.
Changed approach:
- Use the issue's assignee field (e.g., "roxas/polecats/dag")
- Parse assignee to get rig and polecat name
- Query tmux for session activity directly (#{session_activity})
This is more reliable since it uses actual tmux session state instead of
trying to find agent records in beads databases.
Fixes hq-kdhf
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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