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/ci/github-actions-cakephp.yml.template

@@ -0,0 +1,49 @@
+name: CakePHP Unit Tests & Quality Gate
+
+on:
+  push:
+    branches: [ main, master, develop ]
+  pull_request:
+    branches: [ main, master, develop ]
+
+jobs:
+  unit-tests:
+    name: Unit Tests (PHP ${{ matrix.php }} - CakePHP)
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.1', '8.2', '8.3']
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Setup PHP & Extensions
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: mbstring, intl, dom, fileinfo, sqlite3, pdo_sqlite, pcov
+          coverage: pcov
+          tools: composer:v2
+
+      - name: Cache Composer Dependencies
+        uses: actions/cache@v4
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ matrix.php }}-cakephp-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-${{ matrix.php }}-cakephp-
+
+      - name: Install Dependencies
+        run: composer update --prefer-stable --prefer-dist --no-interaction --no-progress
+
+      - name: Run CakePHP Tests with Coverage
+        run: |
+          if [ -f "bin/cake" ]; then
+            bin/cake test app --coverage-clover coverage.xml
+          else
+            ./vendor/bin/phpunit --coverage-clover coverage.xml
+          fi
+        env:
+          TMP: /tmp/