add plugin highlight groups to colourscheme

README.md

@@ -143,6 +143,18 @@ Record every decision here with a short rationale. Append new entries; do not re
   - **Priority fix**: Added `(#set! priority 200)` to all custom captures to override built-in captures (@string priority 99, @constant default priority)
   - **Technical note**: Custom queries require `;extends` directive and higher priority than built-in captures to work correctly
   - **Pseudo-class design**: Uses bold brownish-red (primary_strong) instead of green to distinguish behavioral modifiers (:hover, :focus) from structural selectors (.class, #id)
+- 2025-12-11: Colorscheme Phase 11.8:
+  - **LSP highlights**: Comprehensive diagnostic and UI highlights
+  - **LSP diagnostics**: Error (red #d70000), Warn (orange #d75f00), Info (blue #8989af), Hint (green #89af89)
+  - **LSP diagnostic UI**: Underlines (undercurl for errors/warnings), signs, floating windows, virtual text with tinted backgrounds
+  - **LSP references**: Cyan background gradients - Text (#e0eaff subtle), Read (#d4f0ff medium), Write (#a3e0ff strong)
+  - **LSP semantic tokens**: Fallback groups linking to TreeSitter equivalents for consistency
+  - **Telescope highlights**: Neutral base with primary accent for matching, selection, and titles
+  - **Gitsigns highlights**: Status colors - Add (green), Change (blue), Delete (red); inline diff backgrounds
+  - **nvim-cmp highlights**: Primary tones for item kinds, bold for match highlighting, italic for menu
+  - **Oil.nvim highlights**: Bold directories, status colors for permissions (read=green, write=orange, execute=blue), operation colors
+  - **indent-blankline**: Subtle grays for guides and scope
+  - **nvim-ufo**: Subtle backgrounds for folds with preview support
 
 ## Project-Local Configuration (design)