Enables cross-repo issue lookups via routes.jsonl configuration.
Running `bd show gt-xyz` from ~/gt now routes to the correct beads
directory based on the issue ID prefix.
- Add internal/routing/routes.go with routing logic
- Add cmd/bd/routed.go with routed storage helpers
- Update show command to use routed resolution in direct mode
- Support redirect files for canonical database locations
- Debug output available via BD_DEBUG_ROUTING=1
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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