Adds a popup menu showing core Gas Town agents (Mayor, Deacon,
Witnesses, Refineries, Crew) grouped by rig with color coding.
Polecats are hidden by default (use -a to include).
Usage:
gt agents - show popup menu
gt agents list - text output
gt ag -a - include polecats
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>