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/parsica-php/parsica/tests/Parser/RunningParsersTest.php

@@ -0,0 +1,43 @@
+<?php declare(strict_types=1);
+/**
+ * This file is part of the Parsica library.
+ *
+ * Copyright (c) 2020 Mathias Verraes <mathias@verraes.net>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Tests\Parsica\Parsica\Parser;
+
+use PHPUnit\Framework\TestCase;
+use Parsica\Parsica\ParserHasFailed;
+use Parsica\Parsica\StringStream;
+use function Parsica\Parsica\char;
+use function Parsica\Parsica\skipSpace;
+use function Parsica\Parsica\string;
+
+final class RunningParsersTest extends TestCase
+{
+    /** @test */
+    public function try_throws()
+    {
+        $parser = char('a');
+        $result = $parser->try(new StringStream("a"));
+        $this->assertSame("a", $result->output());
+
+        $this->expectException(ParserHasFailed::class);
+        $result = $parser->try(new StringStream("b"));
+    }
+
+    /** @test */
+    public function continueFrom()
+    {
+        $parser = string('hello')->sequence(skipSpace());
+        $result = $parser->try(new StringStream("hello world!"));
+        $parser2 = string("world");
+        $result2 = $parser2->continueFrom($result);
+        $this->assertEquals("world", $result2->output());
+        $this->assertEquals("!", $result2->remainder());
+    }
+}