detectSender() only detected polecats, not crew workers. Crew workers
like Emma at /Users/stevey/gt/beads/crew/emma were incorrectly
defaulting to mayor/ instead of getting their proper address.
Added /crew/ directory pattern matching parallel to the existing
/polecats/ detection, extracting rig/crewName address format.
Fixes: gt-70b3
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>