fix: status tools report a hook throwing during the write as partial_write

publish/unpublish/schedule/trash run their WordPress call through StatusWrite:
a throwing hook becomes WriteFailed (rollback incomplete, with post_id) and is
logged with result partial instead of surfacing as internal_error.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

tests/Unit/Integrations/WordPress/Status/PostUnpublishAbilityTest.php

@@ -5,11 +5,13 @@ declare(strict_types=1);
 namespace LIT\MCP\Tests\Unit\Integrations\WordPress\Status;
 
 use Brain\Monkey\Functions;
+use LIT\MCP\Abilities\WriteFailed;
 use LIT\MCP\ChangeLog\ChangeLog;
 use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
 use LIT\MCP\Integrations\WordPress\Status\PostUnpublishAbility;
 use LIT\MCP\Tests\Unit\TestCase;
 use Mockery;
+use RuntimeException;
 use WP_Post;
 
 final class PostUnpublishAbilityTest extends TestCase
@@ -37,6 +39,25 @@ final class PostUnpublishAbilityTest extends TestCase
         self::assertSame('unpublished', $result['changed'][0]['action']);
     }
 
+    public function testAHookThrowingDuringTheWriteIsAPartialWrite(): void
+    {
+        Functions\when('wp_update_post')->alias(static function (): void {
+            throw new RuntimeException('save_post-Hook kaputt');
+        });
+        $log = Mockery::mock(ChangeLog::class);
+        $log->expects('recordPartial')->with('lit/post-unpublish', 'page', '5', Mockery::type('string'));
+
+        try {
+            $this->ability($log, 'publish')->execute(['post_id' => 5]);
+            self::fail('WriteFailed expected');
+        } catch (WriteFailed $e) {
+            self::assertFalse($e->rolledBack);
+            self::assertSame(5, $e->postId);
+            self::assertStringContainsString('save_post-Hook kaputt', $e->getMessage());
+            self::assertSame('lit_partial_write', $e->toError()->get_error_code());
+        }
+    }
+
     public function testATrashedPostIsRefusedInsteadOfBecomingADraft(): void
     {
         Functions\expect('wp_update_post')->never();