BREAKING CHANGES:
- Install now defaults to local (.claude/skills/) instead of global
- Removed --local flag (local is now default)
- Use -g or --global flag for global installation

New Features:
- Automatic skills-lock.json creation in projects
- Better project isolation
- Follows npm/yarn convention (local by default)
- Added -g shorthand for global installation

Fixes:
- Registry response reading now uses config instead of env var
- Proper error handling for missing registry configuration
- Transaction confirmation polling removed (faster publishes)

Migration:
- If you were using default install (global), add -g flag
- If you were using --local flag, remove it (now default)
- All existing global installations remain unaffected