51 clippy warnings -> 0, with 8 justified #[allow]s (IPC arity, specta wire
types, and the 9 test-only await-holding-lock sites). 27 raw lock calls moved to
the poison-tolerant helpers - all of them test code; production was already
clean.
Caught a non-neutral clippy --fix: removing the redundant 'use hostname;' in
credentials.rs orphaned its #[cfg(target_os = "linux")] onto SERVICE_NAME,
which would have cfg'd the constant out of every non-Linux build. Compiles clean
on Linux, so only Windows/macOS CI would have caught it.
dtourolle
889289286b