Tighten prompt_template_source.notes: explicit 5-tier classification per 2026-06-01 priority rules

metadata.json

@@ -52,7 +52,7 @@
       "prompt_template_source": {
         "origin": "official",
         "reference": "https://github.com/EvolvingLMMs-Lab/lmms-eval/blob/main/lmms_eval/tasks/visualmrc/utils.py (visualmrc_doc_to_text — bare question; reading comprehension)",
-        "notes": "lmms-eval VisualMRC canonical evaluation prompt."
+        "notes": "Tier 4: lmms-eval VisualMRC canonical evaluation prompt."
       }
     }
   }