Arm-B-first ordering: prioritise primary endpoint for all readers

app.py

@@ -247,10 +247,16 @@ def migrate_responses(old, new):
 
 # ----------------------------------------------------------------------------- ordering
 def reader_order(annotator):
-    ids = [c["case_id"] for c in CASES]
+    # Arm B (discovered-category coherence) is the paper's primary endpoint and time is short, so we present
+    # every reader's remaining Arm B cases first, then Arm A. Each arm is still shuffled by the reader's own
+    # seed (internal blinding of the hidden pos/neg controls is preserved), and completed cases are skipped by
+    # first_unfinished_idx, so a reader resumes into her next unfinished Arm B case and keeps all prior work.
     seed = int(hashlib.sha256(annotator.encode()).hexdigest(), 16) % (2**32)
-    random.Random(seed).shuffle(ids)
-    return ids
+    b_ids = [c["case_id"] for c in CASES if c.get("arm", "A") == "B"]
+    a_ids = [c["case_id"] for c in CASES if c.get("arm", "A") != "B"]
+    random.Random(seed).shuffle(b_ids)
+    random.Random(seed + 1).shuffle(a_ids)
+    return b_ids + a_ids
 
 
 def first_unfinished_idx(order, records):