Use x11rb directly for screenshot capture and window metadata so the Linux build no longer drags in Wayland build dependencies.
Co-authored-by: Codex <noreply@openai.com>
- Add imageproc and ab_glyph dependencies
- Annotation module drawing colored bounding boxes per window
- White @wN labels on dark background at each window's top-left
- 8-color palette cycling for distinct window identification
- Back-to-front iteration so topmost labels are not occluded
- Embedded DejaVu Sans Mono font via include_bytes
- Wire --annotate flag into snapshot pipeline
- Add xcap and image dependencies
- DesktopBackend trait with all 16 methods for future extensibility
- X11Backend with real snapshot() using xcap Window::all() and
Monitor::all() for z-ordered window enumeration and screenshot
- Stub implementations for input/window management (phases 4-6)
- Wire X11Backend into DaemonState (now returns Result)
- Real snapshot handler replacing placeholder, updates ref map
