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/gitlab-ci-cakephp.yml.template

@@ -0,0 +1,22 @@
+# GitLab CI/CD Pipeline for CakePHP Unit Testing
+image: php:8.2-cli-alpine
+
+stages:
+  - test
+
+cache:
+  key: ${CI_COMMIT_REF_SLUG}
+  paths:
+    - vendor/
+
+unit-test:
+  stage: test
+  before_script:
+    - apk add --no-cache sqlite-libs icu-dev libzip-dev zip unzip git $PHPIZE_DEPS
+    - pecl install pcov && docker-php-ext-enable pcov
+    - docker-php-ext-configure intl && docker-php-ext-install intl pdo pdo_sqlite zip
+    - curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+    - composer install --prefer-dist --no-progress --no-interaction
+  script:
+    - if [ -f "bin/cake" ]; then bin/cake test app --coverage-text; else ./vendor/bin/phpunit --coverage-text; fi
+  coverage: '/^\s*Lines:\s*\d+.\d+\%/'