Fix: delete leftover .onnx on unsolved tasks, --strict_score default False

neurogolf_solver/solvers/solver_registry.py

@@ -75,10 +75,21 @@ def _accept_model(path, td, providers):
     return True
 
 
+def _cleanup_failed(path):
+    """Delete leftover .onnx file from failed solve attempts.
+    Prevents bad files from ending up in submission zip."""
+    try:
+        if os.path.exists(path):
+            os.remove(path)
+    except OSError:
+        pass
+
+
 def solve_task(tn, td, outdir, providers, conv_budget=30.0, excluded_tasks=None):
     """Solve a single ARC-AGI task.
     
     Returns: (ok, solver_name, file_size, elapsed, model_path)
+    If unsolved, deletes any leftover .onnx file.
     """
     if excluded_tasks is None:
         excluded_tasks = EXCLUDED_TASKS
@@ -139,4 +150,6 @@ def solve_task(tn, td, outdir, providers, conv_budget=30.0, excluded_tasks=None)
                 sname, model = result
                 return True, sname, os.path.getsize(path), time.time() - t_start, path
 
+    # All solvers failed — delete leftover .onnx file
+    _cleanup_failed(path)
     return False, None, None, time.time() - t_start, path