refactor: add constants package for magic strings
Create internal/constants/constants.go with centralized definitions for:
- Directory names (mayor, polecats, crew, etc.)
- File names (rigs.json, town.json, state.json)
- Git branch names (main, beads-sync)
- Tmux session names (gt-mayor, gt-deacon)
- Agent role names
Add helper functions for common path construction:
- MayorRigsPath(), MayorTownPath(), MayorStatePath()
- RigMayorPath(), RigBeadsPath(), RigPolecatsPath()
Update key files to use the new constants:
- internal/cmd/rig_helpers.go
- internal/cmd/status.go
- internal/daemon/daemon.go
Closes: gt-xnql
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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