- Add ratatui-image and image crates for terminal image support
- Auto-detect terminal protocol (Kitty/iTerm2/Sixel) with halfblocks fallback
- Render inline images with Protocol API, cache decoded images
- Handle partial scroll visibility via temp-buffer rendering
- Support alpha compositing (RGBA→RGB) and dynamic height adjustment
- Add force_halfblocks config option to bypass protocol detection
- Suppress link brackets around image-wrapped links
- Remove bundled vault files (demo content moved to test vault)
- Add .gitignore for target dir and .DS_Store
