test(markdown): remove diagnostic marker, keep slash verification test

移除 data-pipeline-v2 诊断标记(已完成使命:确认新二进制含新代码)。
保留 full_pipeline_wrap_then_clean_preserves_slash 测试,它验证完整
渲染管线(wrap → clean_html)的斜杠格式不被 sanitizer 破坏。

根因记录: 文章正文 HTML 存在 posts.content_html 字段,创建/更新时
渲染一次存入 DB,展示时直接读 DB 不重新渲染。blur-up 的 markdown
改动只对新渲染生效,存量文章需重新保存或 rebuild_content_html 触发重渲染。

src/api/markdown.rs

@@ -375,6 +375,18 @@ mod tests {
         assert!(result.contains(" / "), "aspect-ratio must use slash separator, got: {}", result);
     }
 
+    #[test]
+    fn full_pipeline_wrap_then_clean_preserves_slash() {
+        // 模拟完整渲染管线：wrap_images_with_blur → clean_html
+        // 验证 sanitizer 不把斜杠转义或删掉
+        let html = r#"<img src="/uploads/2026/06/18/090402.21c4f0b6-6d5a-49ee-bc79-99cb557ff385.webp" alt="t">"#;
+        let wrapped = wrap_images_with_blur(html);
+        let cleaned = clean_html(&wrapped);
+        println!("WRAPPED:  {}", wrapped);
+        println!("CLEANED:  {}", cleaned);
+        assert!(cleaned.contains(" / "), "clean_html must preserve slash in --ar, got: {}", cleaned);
+    }
+
     #[test]
     fn slugify_heading_simple() {
         assert_eq!(slugify_heading("Hello World"), "hello-world");