Update CLAUDE.md: streamline instructions, remove outdated Tailwind CSS details, clarify stylesheet structure and PostCSS incremental build integration

Author: liberaldev

CLAUDE.md

@@ -21,16 +21,6 @@ bundle exec rake serve
 bundle exec jekyll serve --watch --future --incremental
 ```
 
-### CSS (Tailwind)
-
-```bash
-# Build CSS (production)
-npm run build-css
-
-# Watch CSS for development
-npm run watch-css
-```
-
 ### Testing & Quality Assurance
 
 ```bash
@@ -40,6 +30,7 @@ bundle exec rake test
 # Run individual test suites
 bundle exec rake test-news-plugin     # News archive plugin tests
 bundle exec rake test-linter          # Linter library tests
+bundle exec rake test-postcss-incremental-fix-plugin # PostCSS incremental build plugin tests
 
 # Linting
 bundle exec rake lint                 # Markdown linter
@@ -83,17 +74,18 @@ bundle exec rake new_post:fr    # French
 - `_data/`: YAML data files (releases.yml, downloads.yml, branches.yml, locales/)
 - `lib/`: Ruby utilities (linter, markup checker, draft release)
 - `test/`: Test files for plugins and linter
-- `stylesheets/`: CSS source
+- `stylesheets/`: CSS source (includes partials in underscored directories like `_components/` and files starting with `_`)
 - `_javascripts_src/`: TypeScript source files
 - `javascripts/`: Compiled JavaScript output
 
 ### Design System (Tailwind CSS)
 
 The site uses a custom Tailwind configuration with:
 
-- **Semantic color tokens** via CSS variables (defined in `tailesheets/semantic-colors.css`)
+- **Semantic color tokens** via CSS variables (defined in `stylesheets/semantic-colors.css`)
   - Accessible via `bg-semantic-*`, `text-semantic-*`, `border-semantic-*` classes
   - Automatically handles light/dark mode via `prefers-color-scheme`
+- **Incremental Build**: Uses `_plugins/postcss_incremental_fix.rb` to trigger PostCSS rebuilds when HTML, Markdown, or CSS partials (e.g., `_*.css` or files within `_*` directories) are modified during `jekyll serve --incremental`
 - **Brand colors**: Ruby (red) and Gold palettes
 - **Typography plugin** for prose styling
 - **Custom breakpoints**: Container max-widths configured for content layouts