unwrap pyodide object correctly

[arnavsinghvi11]

Fix for #8448

pyodide wraps generated python code in a Pyproxy object that cant be JSON-encoded so .toJS() properly converts python to js object which can. resolves failing cases mentioned in #8448

[[ ## final_generated_code ## ]]
def final_answer():
    result = 2 * 5 + 4
    return {"answer": result}

final_answer()

[[ ## code_output ## ]]
# Previously incorrect - {}
# Now correctly outputs - {"answer": 14}

echo '{"code": "{\\"answer\\": 14}"}' \
  | deno run --allow-read dspy/primitives/runner.js

# Previously incorrect - {"output":{}}
# Now correctly outputs - {"output":{"answer":14}}

[chenmoneygithub]

LGTM!