R6A-R4-R8 clean candidate remove leaked preview artifact

static/previews/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.json

@@ -1 +0,0 @@
-{"task_id": "task_r6a_r4_r4_progress", "request_hash": "e954898a5de4d01e361ec143cb36e8d46838844310afe6e74a5b9448335eb673", "execution_epoch": 1, "stage": "", "text": "", "complete": false, "target_stage": "translation_qa:Findings", "target_text": "# Кіріспе\n\nДайын.", "target_complete": false, "target_english_commit_text": "", "target_progress": {"qa_passed": 0, "repair_pending": 1, "queued": 2, "in_flight": 1, "total": 3}, "updated_at": "2026-08-17T05:08:49.171257+00:00"}