swarm-controller: export jobq state rollup as OTEL gauges

swarm-controller/Cargo.toml

@@ -38,6 +38,20 @@ problem_details = { version = "0.9.0", features = ["axum"] }
 # same shape `hive-c0re/src/job_queue/scheduler.rs` uses over its own graph.
 hive-jobq.workspace = true
 hive-jobq-wire.workspace = true
+# OTEL SDK for the jobq-rollup metrics exporter (`jobq_metrics.rs`). Same
+# versions + blocking-client rationale as `hive-c0re`/`hive-metric`: the
+# metrics SDK's `PeriodicReader` runs on a background thread with no Tokio
+# reactor, where the async client panics. Kept local rather than in
+# `workspace.dependencies` — same call `hive-metric` already made, this is
+# still the only other crate that needs it.
+opentelemetry = "0.32"
+opentelemetry_sdk = { version = "0.32", features = ["metrics"] }
+opentelemetry-otlp = { version = "0.32", default-features = false, features = [
+  "metrics",
+  "http-json",
+  "reqwest-blocking-client",
+  "reqwest-rustls",
+] }
 # The forge webhook HMAC (`webhook.rs`). Kept in this crate rather than
 # shared with hive-c0re's equivalent: c0re's copy is scheduled to be deleted
 # with its webhook routes once registration moves here, so the second holder