Expand description
Fire-and-forget notification to a sidecar. No response, no per-call
timeout. Prefers the streaming multiplexer under
LAND_VINE_STREAMING=1; falls through to unary on any failure.
After a successful wire send, fans out via PublishNotification::Fn
so broadcast subscribers (Effect-TS fibers, OTel emitters, future
Mist-WS bridge, dev log) can observe the same flow concurrently.