Dispatches a notification on every requested channel and reports the settled outcome of each, without throwing.

Unlike INotifier.send, this never rejects: a failed channel is reported as { channel, ok: false, error } rather than raised, so a caller (typically one behind a retrying queue) can retry the failing channel alone instead of re-sending the whole notification. An unknown channel name is reported as ok: false, matching send's existing treatment of it as a failure.

Optional on the contract so existing implementors are not broken; resolve it with ?. and fall back to INotifier.send when absent.