Fix Div Zero Guard

The model receives the prompt (and optional system message). The run uses scorer contains_all with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Fix the bug and return corrected Python code only.

def safe_div(a, b):
    return a / b

{
  "expected_contains": [
    "if b == 0",
    "return a / b"
  ]
}