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/squizlabs/php_codesniffer/CodeSniffer.conf.dist

@@ -0,0 +1,9 @@
+<?php
+$phpCodeSnifferConfig = [
+    'default_standard' => 'PSR2',
+    'report_format'    => 'summary',
+    'show_warnings'    => '0',
+    'show_progress'    => '1',
+    'report_width'     => '120',
+];
+?>