Major improvements:
- Add common.sh library for consistent error handling and logging
- Fix hardcoded values in scripts (signing identity, volume names, GitHub repo)
- Add comprehensive release documentation with lessons learned
- Create Sparkle key management guide
- Add clean.sh script for managing build artifacts
- Improve error handling and validation across all scripts
- Update lint.sh with proper documentation and better error handling
- Make generate-appcast.sh fail fast if private key is missing
Script improvements:
- release.sh: Add GitHub CLI auth check, remote tag validation
- notarize-app.sh: Auto-detect signing identity from keychain
- create-dmg.sh: Make volume name configurable
- generate-appcast.sh: Extract GitHub info from git remote
- All scripts: Add proper documentation headers
This ensures more reliable and maintainable release process.
