- Add internal/beads/routes.go with helpers to manage routes.jsonl
- Update gt rig add to auto-append routes for new rigs
- Add prefix-conflict check to gt doctor
bd already has prefix routing via routes.jsonl - this wires up
Gas Town to maintain routes when rigs are added and detect conflicts.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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