feat: wire NATS event publisher into bootstrap + worker

- Both binaries connect to NATS on startup, ensure JetStream stream
- EventPublisherAdapter<NatsTransport> replaces LogEventPublisher
- nats_url config with default nats://localhost:4222
- Deleted bootstrap's LogEventPublisher (no longer needed)

crates/adapters/nats/src/lib.rs

@@ -100,9 +100,7 @@ impl MessageSource for NatsMessageSource {
             if let Ok(info) = stream.consumer_info(CONSUMER_NAME).await
                 && info.config.deliver_subject.is_some()
             {
-                tracing::info!(
-                    "deleting old push consumer '{CONSUMER_NAME}', replacing with pull"
-                );
+                tracing::info!("deleting old push consumer '{CONSUMER_NAME}', replacing with pull");
                 let _ = stream.delete_consumer(CONSUMER_NAME).await;
             }