Adds `bd dep tree --format mermaid` to export dependency trees as Mermaid.js flowcharts.
Features:
- Status indicators: ☐ open, ◧ in_progress, ⚠ blocked, ☑ closed
- Theme-agnostic design
- Works with --reverse flag
- Comprehensive unit tests following TDD
Co-authored-by: David Laing <david@davidlaing.com>
- Add --reverse flag to tree command documentation
- Document normal vs reverse mode differences
- Add comprehensive reverse mode section with use cases
- Update examples to show both directions