Adds a new fixable doctor check that verifies beads routing configuration:
- Checks if routes.jsonl exists
- Verifies all rigs have routing entries (by path, not just prefix)
- Validates that routes point to valid locations with .beads directories
- Can auto-fix by adding missing routes with --fix
The check is smart about prefix mismatches: if a rig already has a route
by path (e.g., gastown/mayor/rig), it won't report it as missing even if
the prefix in rigs.json differs from what's in routes.jsonl.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>