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/symfony/contracts/phpunit.xml.dist

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/13.1/phpunit.xsd"
+         backupGlobals="false"
+         colors="true"
+         bootstrap="vendor/autoload.php"
+         failOnDeprecation="true"
+         failOnRisky="true"
+         failOnWarning="true"
+>
+    <php>
+        <ini name="error_reporting" value="-1" />
+    </php>
+
+    <testsuites>
+        <testsuite name="Symfony Contracts Test Suite">
+            <directory>./Tests/</directory>
+            <directory>./Service/Test/</directory>
+            <directory>./Translation/Test/</directory>
+        </testsuite>
+    </testsuites>
+
+    <source ignoreSuppressionOfDeprecations="true">
+        <deprecationTrigger ignoreUndefinedTriggers="true">
+            <function>trigger_deprecation</function>
+            <method>Doctrine\Deprecations\Deprecation::trigger</method>
+            <method>Doctrine\Deprecations\Deprecation::triggerIfCalledFromOutside</method>
+        </deprecationTrigger>
+        <include>
+            <directory>./</directory>
+        </include>
+        <exclude>
+            <directory>./Tests</directory>
+            <directory>./Service/Test/</directory>
+            <directory>./Translation/Test/</directory>
+            <directory>./vendor</directory>
+        </exclude>
+    </source>
+
+    <extensions>
+        <bootstrap class="Symfony\Bridge\PhpUnit\SymfonyExtension" />
+    </extensions>
+</phpunit>