- Add Desktop platform to description and features
- Add Desktop requirements section (macOS, JDK 17+)
- Add Desktop column to Available Tools table
- Add Desktop-Specific Tools section with 10 tools
- Add Desktop usage examples
- Update architecture diagram with Desktop
- Link to docs/SPEC_DESKTOP.md for detailed API
- Fix prepublishOnly to include build:desktop

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>