feat: add comprehensive unit testing support for CakePHP

- Add 4 CakePHP Claude Code skills: cakephp-unit-test, cakephp-test-setup, cakephp-test-review, cakephp-mock-helper
- Add 11 CakePHP PHPUnit component templates (Table, Entity, Controller, Service, Command, Component, Middleware, Mailer, Form, Behavior, Helper)
- Add CakePHP configs (phpunit.xml.dist, app_local.test.php for SQLite in-memory)
- Add comprehensive CakePHP documentation and component guides
- Update test-runner.sh and installer to auto-detect Laravel and CakePHP
- Add CakePHP CI/CD templates for GitHub Actions and GitLab CI
- Update system prompt, verification checklist, and README with dedicated guides

templates/cakephp/phpunit/HelperTest.template.php

@@ -0,0 +1,48 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Test\TestCase\View\Helper;
+
+use App\View\Helper\{{HELPER_NAME}}Helper;
+use Cake\TestSuite\TestCase;
+use Cake\View\View;
+
+/**
+ * App\View\Helper\{{HELPER_NAME}}Helper Test Case
+ */
+class {{HELPER_NAME}}HelperTest extends TestCase
+{
+    /**
+     * Test subject
+     *
+     * @var \App\View\Helper\{{HELPER_NAME}}Helper
+     */
+    protected {{HELPER_NAME}}Helper ${{VARIABLE_NAME}};
+
+    /**
+     * setUp method
+     */
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $view = new View();
+        $this->{{VARIABLE_NAME}} = new {{HELPER_NAME}}Helper($view);
+    }
+
+    /**
+     * tearDown method
+     */
+    protected function tearDown(): void
+    {
+        unset($this->{{VARIABLE_NAME}});
+        parent::tearDown();
+    }
+
+    /**
+     * Test helper initialization and rendering
+     */
+    public function testInitialization(): void
+    {
+        $this->assertInstanceOf({{HELPER_NAME}}Helper::class, $this->{{VARIABLE_NAME}});
+    }
+}