Add new CLI commands:
- add <source>: Add skill from GitHub (owner/repo format)
- remove <name>: Remove installed skill
- Support for --force flag to overwrite existing
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add skills-cli.ts with commands:
- list: Show all skills with eligibility status
- status [id]: Show detailed skill info or summary
- install <id>: Install skill dependencies
Add skills:cli script to package.json
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>