- Document allowed-tools YAML frontmatter field in CONTRIBUTING.md
- Fix install --all cloning repo twice (now clones once and reuses)
- Show skill descriptions from YAML frontmatter in list command
- Delete merged skill/linkedin-ads branch
Closes#3, #4, #5, #6
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>