Adds per-agent-type health tracking to the Mayor's tmux statusline, showing
working/idle counts for Polecats, Witnesses, Refineries, and Deacon.
All agent types are always displayed, even when no agents of that type are
running (shows as '0/0 😺').
Format: active: 4/4 😺 6/10 👁️ 7/10 🏭 1/1 ⛪
Co-authored-by: gastown/crew/dennis <steve.yegge@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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