Replace all fatih/color usages with internal/ui package that provides:
- Semantic color tokens (Pass, Warn, Fail, Accent, Muted)
- Adaptive light/dark mode support via Lipgloss AdaptiveColor
- Ayu theme colors for consistent, accessible output
- Tufte-inspired data-ink ratio principles
Files migrated: 35 command files in cmd/bd/
Add docs/ui-philosophy.md documenting:
- Semantic token usage guidelines
- Light/dark terminal optimization rationale
- Tufte and perceptual UI/UX theory application
- When to use (and not use) color in CLI output
- bd init now auto-sets sync.branch to current git branch
- Fixes 'bd sync --status' error after fresh bd init
- Changed all branch detection to use 'git symbolic-ref' instead of 'git rev-parse' to work in fresh repos without commits
- Updated init.go, init_team.go, sync.go, version.go
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
