Add comprehensive OpenSpec integration for Crush AI assistant including:
- CrushSlashCommandConfigurator for proposal, apply, and archive commands
- Integration with slash command registry and CLI tools
- Generates .crush/commands/openspec/ with proper frontmatter and workflows
- Available via `openspec init --tools crush`
💘 Generated with Crush
Co-authored-by: Crush <crush@charm.land>
Gianluca Boiano