Adds `bd init --stealth` to enable beads usage without affecting repo collaborators:
- Global gitattributes: configures beads merge driver across all repos
- Global gitignore: prevents .beads/ and .claude/settings.local.json from being committed
- Claude Code integration: adds 'bd onboard' instruction automatically
- Respects existing global git config files, only creates when necessary
Perfect for personal experimentation or contributing to repos where not everyone uses beads.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-authored-by: Claude <noreply@anthropic.com>
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