Campaign B v2 (InfoNCE mix) both seeds PASS; retro-erank corrected after overwrite catch (HF copies were the true v1): spread v1 180 > v2 139 (baseline 239) — target granularity governs spread, not loss family

proto_frame/campaign_b/retro_erank.json

@@ -0,0 +1,5 @@
+{
+ "unadapted_B9": 239.2,
+ "v1_s0": 179.5,
+ "v1_s1": 180.5
+}