Sync main.py from blood-brain-omics repo

main.py

@@ -543,6 +543,15 @@ def h2h_blood_summary(
             winner = platforms[0] if (v0 < v1 if asc else v0 > v1) else platforms[1]
             pair_wins[pair_key][winner] = pair_wins[pair_key].get(winner, 0) + 1
 
+    # Ensure both platforms appear in every pair (with explicit 0 for sweeps).
+    # Frontend ranking expects two-key win maps, otherwise pairs where one
+    # platform wins every target get silently dropped from the ranking.
+    for pair_key, wins in pair_wins.items():
+        if "_vs_" in pair_key:
+            a, b = pair_key.split("_vs_", 1)
+            wins.setdefault(a, 0)
+            wins.setdefault(b, 0)
+
     return {
         "metric": metric,
         "covariates": covariates,