When a rig is removed with `gt rig remove`, the route entry in
routes.jsonl was not being cleaned up. This caused problems when
re-adding the rig with a different prefix, resulting in duplicate
entries and prefix mismatch errors.
The fix calls beads.RemoveRoute() during rig removal to clean up
the route entry from routes.jsonl.
Fixes#899
Co-authored-by: dementus <julianknutsen@users.noreply.github>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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