fix(python): add depth limit to py_to_json/json_to_py#469
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Both functions now fail with a clear error beyond 64 nesting levels, preventing stack overflow from deeply nested Python/JSON structures. Closes #427
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Summary
py_to_jsonandjson_to_pyrecursively traverse nested structures without depth limitMAX_NESTING_DEPTH = 64; exceeding it raisesValueErrorTest plan
test_deeply_nested_schema_rejectedCloses #427