- Add hooks_registry.go: LoadRegistry(), HookRegistry/HookDefinition types
- Add hooks_install.go: gt hooks install command with --role and --all-rigs flags
- gt hooks list now reads from ~/gt/hooks/registry.toml
- Supports dry-run, deduplication, and creates .claude dirs as needed
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
