docs: add .paul/codebase/ codebase map (7 documents)

Stack, architecture, conventions, testing, integrations, db_schema, concerns.
Generated by PAUL /map-codebase workflow from codebase analysis.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.paul/codebase/testing.md

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+# Testing — krolewskie-miody.pl
+
+## Current Status
+
+**No testing infrastructure is configured.**
+
+CLAUDE.md acknowledges this: *"Testy — Uzupełnij jak uruchamiać testy"* (incomplete placeholder).
+
+## What's Missing
+
+- No `phpunit.xml` or `phpunit.xml.dist`
+- No `tests/` directory
+- No `.github/workflows/` CI/CD pipelines
+- No PHPUnit dependency in any `composer.json`
+- No JavaScript test runner (Jest, Mocha, etc.)
+- No automated code quality checks on commit
+
+## Recommended Setup
+
+### PHPUnit (WordPress unit tests)
+
+1. Install PHPUnit via Composer in a custom plugin or child theme:
+   ```bash
+   composer require --dev phpunit/phpunit wp-phpunit/wp-phpunit
+   ```
+
+2. Create `phpunit.xml`:
+   ```xml
+   <phpunit bootstrap="tests/bootstrap.php">
+     <testsuites>
+       <testsuite name="krolewskie-miody">
+         <directory>tests/</directory>
+       </testsuite>
+     </testsuites>
+   </phpunit>
+   ```
+
+3. Place test files in `tests/` with `Test` suffix: `tests/class-checkout-test.php`
+
+### Manual Testing Checklist (current practice)
+
+Since no automated tests exist, manual testing covers:
+- Product listing and filtering
+- Add to cart / cart updates
+- Checkout flow (Przelewy24, PayU, PayPal)
+- InPost locker selection
+- Order confirmation emails (via Easy WP SMTP)
+- Coupon application (flexible-coupons-pro)
+- GDPR consent banner (Complianz)
+
+## Notes
+
+- WooCommerce 10.x ships with its own test utilities — can be leveraged for integration tests
+- Code Snippets plugin stores custom PHP in DB — these snippets are not version-controlled or testable via standard tooling