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/Node/Expr/CallLike.php

@@ -0,0 +1,60 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node\Expr;
+
+use PhpParser\Node\Arg;
+use PhpParser\Node\Expr;
+use PhpParser\Node\VariadicPlaceholder;
+
+abstract class CallLike extends Expr {
+    /**
+     * Return raw arguments, which may be actual Args, or VariadicPlaceholders for first-class
+     * callables.
+     *
+     * @return array<Arg|VariadicPlaceholder>
+     */
+    abstract public function getRawArgs(): array;
+
+    /**
+     * Returns whether this call expression is actually a first class callable.
+     */
+    public function isFirstClassCallable(): bool {
+        $rawArgs = $this->getRawArgs();
+        return count($rawArgs) === 1 && current($rawArgs) instanceof VariadicPlaceholder;
+    }
+
+    /**
+     * Assert that this is not a first-class callable and return only ordinary Args.
+     *
+     * @return Arg[]
+     */
+    public function getArgs(): array {
+        assert(!$this->isFirstClassCallable());
+        return $this->getRawArgs();
+    }
+
+    /**
+     * Retrieves a specific argument from the raw arguments.
+     *
+     * Returns the named argument that matches the given `$name`, or the
+     * positional (unnamed) argument that exists at the given `$position`,
+     * otherwise, returns `null` for first-class callables or if no match is found.
+     */
+    public function getArg(string $name, int $position): ?Arg {
+        if ($this->isFirstClassCallable()) {
+            return null;
+        }
+        foreach ($this->getRawArgs() as $i => $arg) {
+            if ($arg->unpack) {
+                continue;
+            }
+            if (
+                ($arg->name !== null && $arg->name->toString() === $name)
+                || ($arg->name === null && $i === $position)
+            ) {
+                return $arg;
+            }
+        }
+        return null;
+    }
+}