Make --green fully non-interactive with Claude-generated commit messages

- Add generateCommitMessage() helper for non-interactive commit message generation
- Replace hardcoded commit messages with Claude-generated ones
- Replace interactive commit prompts for CI fixes with non-interactive flow
- All commits in --green now use Claude without user input
- Maintains CLAUDE.md requirements (no AI attribution, concise style)

This enables truly automated CI green workflow from local checks through CI fixes.

Author: jdalton