Clarify task-specific standard evaluation algorithms

scores.json

@@ -610,7 +610,7 @@
       "precision": "float32",
       "batch_size": 8,
       "seed": 20260918,
-      "similarity": "cosine",
+      "similarity": "Cosine for primary STS/retrieval scores and normalized media-label matching; classification probes and clustering use each official task's algorithms.",
       "encoder_parameters_frozen": true,
       "classification": "Official task-specific frozen-embedding probes or fixed-label zero-shot classification.",
       "sampling": "Official task subsampling and repeated-probe protocols are preserved.",