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/process/Messenger/RunProcessContext.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Process\Messenger;
+
+use Symfony\Component\Process\Process;
+
+/**
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+final class RunProcessContext
+{
+    public readonly ?int $exitCode;
+    public readonly ?string $output;
+    public readonly ?string $errorOutput;
+
+    public function __construct(
+        public readonly RunProcessMessage $message,
+        Process $process,
+    ) {
+        $this->exitCode = $process->getExitCode();
+        $this->output = $process->isOutputDisabled() ? null : $process->getOutput();
+        $this->errorOutput = $process->isOutputDisabled() ? null : $process->getErrorOutput();
+    }
+}

vendor/symfony/process/Messenger/RunProcessMessage.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Process\Messenger;
+
+/**
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+class RunProcessMessage implements \Stringable
+{
+    public function __construct(
+        public readonly array $command,
+        public readonly ?string $cwd = null,
+        public readonly ?array $env = null,
+        public readonly mixed $input = null,
+        public readonly ?float $timeout = 60.0,
+    ) {
+    }
+
+    public function __toString(): string
+    {
+        return implode(' ', $this->command);
+    }
+}

vendor/symfony/process/Messenger/RunProcessMessageHandler.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Process\Messenger;
+
+use Symfony\Component\Process\Exception\ProcessFailedException;
+use Symfony\Component\Process\Exception\RunProcessFailedException;
+use Symfony\Component\Process\Process;
+
+/**
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+final class RunProcessMessageHandler
+{
+    public function __invoke(RunProcessMessage $message): RunProcessContext
+    {
+        $process = new Process($message->command, $message->cwd, $message->env, $message->input, $message->timeout);
+
+        try {
+            return new RunProcessContext($message, $process->mustRun());
+        } catch (ProcessFailedException $e) {
+            throw new RunProcessFailedException($e, new RunProcessContext($message, $e->getProcess()));
+        }
+    }
+}