refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/phpdocumentor/graphviz/.gitignore

@@ -0,0 +1,18 @@
+# IDE Shizzle; it is recommended to use a global .gitignore for this but since this is an OSS project we want to make
+# it easy to contribute
+.idea
+/nbproject/private/
+.buildpath
+.project
+.settings
+
+# Build folder and vendor folder are generated code; no need to version this
+build/
+vendor/
+temp/
+tools/
+*.phar
+
+# By default the phpunit.xml.dist is provided; you can override this using a local config file
+phpunit.xml
+composer.lock