Adds --prefix as a forgiving alias to --rig flag. Accepts:
- Exact prefix: bd-, gt-
- Prefix without hyphen: bd, gt
- Rig name: beads, gastown
All resolve to the correct rig via routes.jsonl lookup.
This matches agents' mental model of prefix-based routing.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>