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/Internal/FP/CurryTest.php

@@ -0,0 +1,47 @@
+<?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\Internal\FP;
+
+use PHPUnit\Framework\TestCase;
+use function Parsica\Parsica\Curry\curry;
+
+final class CurryTest extends TestCase
+{
+    /** @test */
+    public function curry()
+    {
+        $f = fn($a, $b, $c) => $a + $b + $c;
+        $curried = curry($f);
+
+        $this->assertIsCallable($curried);
+        $this->assertIsCallable($curried(1));
+        $this->assertIsCallable($curried(1)(2));
+        $this->assertIsCallable($curried(1)(2));
+
+        $this->assertEquals(6, $curried(1)(2)(3));
+    }
+
+    /** @test */
+    public function partial_application()
+    {
+        $f = fn($a, $b, $c) => $a + $b + $c;
+
+        $this->assertIsCallable(curry($f, 1));
+        $this->assertIsCallable(curry($f, 1, 2));
+
+        // I would expect this:
+//        $this->assertEquals(6, curry($f, 1, 2, 3));
+
+        // But we must add a () at the end, which I feel is a bug:
+        $this->assertIsCallable(curry($f, 1, 2, 3));
+        $this->assertEquals(6, curry($f, 1, 2, 3)());
+    }
+}