Release v1.27.0

feat: improve scud view with per-phase diagrams and pan/zoom

- Remove scud serve command (duplicate of scud view)
- Add SCG format parser to scud view (no longer requires JSON)
- Generate per-phase mermaid diagrams with individual pan/zoom controls
- Add simplified view toggle (hides subtasks, on by default)
- Auto-fit zoom to show all nodes in viewport
- Mouse drag to pan, scroll wheel to zoom
- Zoom controls (+, -, reset) in each phase header

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>