Changes
PR #1689 by ksylvan: Enhanced Shell Completions for Fabric CLI Binaries
- Add 'fabric-ai' alias support across all shell completions
- Use invoked command name for dynamic completion list queries
- Refactor fish completions into reusable registrar for multiple commands
- Update Bash completion to reference executable via COMP_WORDS[0]
- Install completions automatically with new cross-shell setup script