- Added a custom JSON replacer that unwraps `Error` instances in logger output, preserving name, message, stack, cause, and enumerable fields.
- Updated uncaught-exception and unhandled-rejection logging paths to pass only `{ err }`, relying on the logger serializer for full error details.
- Extended transient socket-close matching to detect HTTP2 stream reset/refused/calm errors and added regression tests for logger error serialization behavior.
