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/doctrine/lexer/README.md

@@ -0,0 +1,9 @@
+# Doctrine Lexer
+
+[![Build Status](https://github.com/doctrine/lexer/workflows/Continuous%20Integration/badge.svg)](https://github.com/doctrine/lexer/actions)
+
+Base library for a lexer that can be used in Top-Down, Recursive Descent Parsers.
+
+This lexer is used in Doctrine Annotations and in Doctrine ORM (DQL).
+
+https://www.doctrine-project.org/projects/lexer.html