- Replace str(exc) with repr(exc) in lookup() and _batch_api_call()
so exception class name is always present even for no-message errors
(e.g. aiohttp.ServerDisconnectedError() whose str() is empty)
- Add exc_type=type(exc).__name__ field to network-error log events
for easy structured-log filtering
- Move import aiohttp to runtime import; use aiohttp.ClientTimeout()
instead of raw float, removing # type: ignore[arg-type] workarounds
- Add TestErrorLogging with 3 tests covering empty-message exceptions