Track the two crowd rolls as _sheet_crowd3/3b — _refcheck is scratch and they are the only copy of the art

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

assets/_crowdpass.py

@@ -4,7 +4,8 @@
 #   uv run --with pillow --with numpy --with scipy python assets/_crowdpass.py            # install
 #   uv run --with pillow --with numpy --with scipy python assets/_crowdpass.py --review   # to _refcheck
 #
-# INPUT   assets/_refcheck/crowd_seat.png + crowd_clap.png  (see `_crowdroll.py`)
+# INPUT   assets/_sheet_crowd3.png + _sheet_crowd3b.png — the two rolls (see `_crowdroll.py`),
+#         tracked, because _refcheck is scratch and these are the only copy of the art
 # OUTPUT  assets/x_crowd{,2}.png · x_crowd_c{,2}.png · x_crowd_h{,2}.png · src/crowd.js
 #
 # THE PROBLEM THIS SOLVES. Ask a generator for "the same picture with some arms raised" and about a
@@ -158,8 +159,8 @@ def write_table(boxes, h, w):
 
 
 def main(review):
-    A = np.asarray(Image.open(os.path.join(REFCHECK, 'crowd_seat.png')).convert('RGB'))
-    B = np.asarray(Image.open(os.path.join(REFCHECK, 'crowd_clap.png')).convert('RGB'))
+    A = np.asarray(Image.open(os.path.join(HERE, '_sheet_crowd3.png')).convert('RGB'))
+    B = np.asarray(Image.open(os.path.join(HERE, '_sheet_crowd3b.png')).convert('RGB'))
     arms, lab = raisers(A, B)
     h, w = A.shape[:2]