Add safety check notification and error handling (#19055)

Adds a new app-server notification that fires when a user account has
been flagged for potential safety reasons.

codex-rs/otel/src/events/session_telemetry.rs

@@ -1058,6 +1058,7 @@ impl SessionTelemetry {
                 "reasoning_summary_part_added".into()
             }
             ResponseEvent::ServerModel(_) => "server_model".into(),
+            ResponseEvent::ModelVerifications(_) => "model_verifications".into(),
             ResponseEvent::ServerReasoningIncluded(_) => "server_reasoning_included".into(),
             ResponseEvent::RateLimits(_) => "rate_limits".into(),
             ResponseEvent::ModelsEtag(_) => "models_etag".into(),