fix: rewrite all unit tests to match actual class signatures

All 14 test files updated to use correct constructor patterns (array-based
value objects, dependency injection for ContentAnalyzer, etc.) and verified
method names against source.

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

tests/bootstrap.php

@@ -2,17 +2,14 @@
 /**
  * PHPUnit bootstrap for PRAutoBlogger unit tests.
  *
- * Loads Brain\Monkey for WordPress function mocking,
- * then requires the source files under test.
+ * Loads composer autoloader and defines WordPress constants.
+ * Brain\Monkey setup is done in BaseTestCase, not here.
  *
  * @package PRAutoBlogger\Tests
  */
 
 require_once dirname( __DIR__ ) . '/vendor/autoload.php';
 
-// Brain\Monkey sets up Patchwork & function stubs.
-\Brain\Monkey\setUp();
-
 // Define WordPress constants that source files expect.
 if ( ! defined( 'ABSPATH' ) ) {
     define( 'ABSPATH', '/tmp/wordpress/' );