Fixes#299
Added comprehensive documentation to help new users understand what files
should be committed vs ignored after running bd init:
1. README.md:
- New "Files Created by bd init" section
- Clear lists of files to commit vs ignore
- Explains purpose of .gitattributes for team collaboration
2. docs/GIT_INTEGRATION.md:
- Enhanced .gitattributes section with IMPORTANT notice
- Explains why it must be committed (merge driver config)
- Lists benefits of intelligent JSONL merging
Key clarification: .gitattributes should be COMMITTED (not ignored) as it
configures git merge behavior for the entire team.
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Co-Authored-By: Claude <noreply@anthropic.com>
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