swarm-controller: move OTEL deps to workspace level, drop jobq_metrics singleton

swarm-controller/src/main.rs

@@ -917,7 +917,11 @@ async fn main() -> Result<()> {
         hive_jobq::resources::ResourceTable::new(),
     )));
     spawn_jobq_worker(Arc::clone(&jobq), deps);
-    jobq_metrics::spawn_exporter(Arc::clone(&jobq));
+    // Bound to a named variable, not `_` — dropping the provider stops its
+    // `PeriodicReader`, so it must live as long as `main` does (which it
+    // does here: this binding never goes out of scope before the process
+    // exits via `axum::serve(...).await` below).
+    let _jobq_metrics_provider = jobq_metrics::spawn_exporter(Arc::clone(&jobq));
 
     // Same "log and carry on" shape as the queue/bridge/forge wiring above.
     // A controller that cannot hold a webhook secret still serves every