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

metadata.json

@@ -43,7 +43,7 @@
       "prompt_template_source": {
         "origin": "official",
         "reference": "https://github.com/EvolvingLMMs-Lab/lmms-eval/blob/main/lmms_eval/tasks/ai2d/utils.py (ai2d_doc_to_text — 'A./B./...' options + 'Answer with the option's letter from the given choices directly.' canonical trailer)",
-        "notes": "lmms-eval AI2D canonical evaluation prompt."
+        "notes": "Tier 4: lmms-eval AI2D canonical evaluation prompt."
       }
     }
   }