🧪 add safe_write_json tests to resilient_io - #48

Review failed: prepareSession failed (500): {"error":{"message":"Wrapper pre-flight failed: /usr/local/bin/kilocode-wrapper.js not found in container","code":-32603,"data":{"code":"INTERNAL_SERVER_ERROR","httpStatus":500,"stack":"WrapperNotReadyError: Wrapper pre-flight failed: /usr/local/bin/kilocode-wrapper.js not found in container\n at WrapperClient.runPreflightChecks (index.js:60515:15)\n at async WrapperClient.ensureRunning (index.js:60618:5)\n at async WrapperClient.ensureWrapper (index.js:60767:9)\n at async index.js:61170:66\n at async resolveMiddleware (index.js:1882:20)\n at async callRecursive (index.js:1913:20)\n at async outputValidatorMiddleware (index.js:1784:20)\n at async callRecursive (index.js:1913:20)\n at async callRecursive (index.js:1913:20)\n at async callRecursive (index.js:1913:20)","path":"prepareSession"}}}