Add QA-ready Countix compatibility subset TSV

README.md

@@ -42,5 +42,7 @@ For internal compatibility use, this repository provides a **Countix-compatible
 - Total rows: 1041
 - Manifest: `subsets/countix_compat_all.tsv`
 - Video IDs only: `subsets/countix_compat_video_ids.tsv`
+- QA-ready TSV: `subsets/countix_compat_qa.tsv` (includes `video_id`, `count`, `question`, `answer`, `lance_uri`)
+- QA rows with missing target count: 1 (`stu6_44`)
 
 Note: this is a compatibility alias for workflow integration and is not the official Countix benchmark release.