change to 0.85 threshold fixed for pillar 2

main.py

@@ -314,8 +314,11 @@ async def analyze_artworks(file_a: UploadFile = File(...), file_b: UploadFile =
         correspondence_map_b64 = fig_to_base64(corr_fig)
 
         n_patches_a = a2b_best.shape[0]
-        adaptive_thresh = max((a2b_best.mean() + a2b_best.std()).item(), 0.5)
-        high_a = (a2b_best > adaptive_thresh).sum().item()
+        
+        _patches_a = a2b_best.shape[0]
+        LITERAL_COPY_THRESH = 0.85
+        high_a = (a2b_best > LITERAL_COPY_THRESH).sum().item()
+        
         pct_copied = round((high_a / n_patches_a) * 100, 1)
 
         # --- PILLAR 3: Substantial Similarity ---