Static ROUTE_NATIVE_LOGS 

static ROUTE_NATIVE_LOGS: Once

Native diagnostics are routed once per process, before any model is loaded: unrouted, one load plus one inference writes 122 lines straight to stderr and corrupts any host that owns it.

Routed to the log facade rather than silenced, so the output still exists - but reaching it takes a log-to-tracing bridge the host installs (tracing_log::LogTracer). Without one these records are dropped, and this workspace does not install it today.