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/nikic/php-parser/lib/PhpParser/Builder/Declaration.php

@@ -0,0 +1,50 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Builder;
+
+use PhpParser;
+use PhpParser\BuilderHelpers;
+
+abstract class Declaration implements PhpParser\Builder {
+    /** @var array<string, mixed> */
+    protected array $attributes = [];
+
+    /**
+     * Adds a statement.
+     *
+     * @param PhpParser\Node\Stmt|PhpParser\Builder $stmt The statement to add
+     *
+     * @return $this The builder instance (for fluid interface)
+     */
+    abstract public function addStmt($stmt);
+
+    /**
+     * Adds multiple statements.
+     *
+     * @param (PhpParser\Node\Stmt|PhpParser\Builder)[] $stmts The statements to add
+     *
+     * @return $this The builder instance (for fluid interface)
+     */
+    public function addStmts(array $stmts) {
+        foreach ($stmts as $stmt) {
+            $this->addStmt($stmt);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Sets doc comment for the declaration.
+     *
+     * @param PhpParser\Comment\Doc|string $docComment Doc comment to set
+     *
+     * @return $this The builder instance (for fluid interface)
+     */
+    public function setDocComment($docComment) {
+        $this->attributes['comments'] = [
+            BuilderHelpers::normalizeDocComment($docComment)
+        ];
+
+        return $this;
+    }
+}