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/worker/src/main.rs

@@ -24,12 +24,19 @@ async fn main() -> anyhow::Result<()> {
     let pool = adapters_postgres::connect(&config.database_url).await?;
     adapters_postgres::run_migrations(&pool).await?;
 
+    let nats_client = async_nats::connect(&config.nats_url).await?;
+    adapters_nats::ensure_stream(&nats_client).await?;
+    info!(nats_url = %config.nats_url, "NATS connected");
+
     let repos = Repos::new(pool);
     let file_storage = Arc::new(adapters_storage::LocalFileStorage::new(
         &config.storage_path,
     ));
     let sidecar_writer: Arc<dyn domain::ports::SidecarWriterPort> = Arc::new(LogSidecarWriter);
-    let event_pub: Arc<dyn domain::ports::EventPublisher> = Arc::new(LogEventPublisher);
+
+    let transport = adapters_nats::NatsTransport::new(nats_client);
+    let event_pub: Arc<dyn domain::ports::EventPublisher> =
+        Arc::new(event_transport::EventPublisherAdapter::new(transport));
 
     let registry = Arc::new(build_plugin_registry(&repos, file_storage, sidecar_writer));
     let process_next = build_process_next_handler(&repos, registry, event_pub);
@@ -49,19 +56,6 @@ async fn main() -> anyhow::Result<()> {
     }
 }
 
-struct LogEventPublisher;
-
-#[async_trait::async_trait]
-impl domain::ports::EventPublisher for LogEventPublisher {
-    async fn publish(
-        &self,
-        event: &domain::events::DomainEvent,
-    ) -> Result<(), domain::errors::DomainError> {
-        info!(event = ?event, "domain event");
-        Ok(())
-    }
-}
-
 struct LogSidecarWriter;
 
 #[async_trait::async_trait]