style: cargo fmt after Phase A

Whitespace + import-grouping fixups in the 9 SDK modules touched by
F-Q-002. No behavior change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/executor-core/src/sdk/pubsub.rs

@@ -38,7 +38,9 @@ pub(super) fn register(engine: &mut RhaiEngine, services: &Services, cx: Arc<Sdk
                 let json = message_to_json(&message);
                 let svc = svc.clone();
                 let cx = cx.clone();
-                block_on("pubsub", async move { svc.publish_durable(&cx, topic, json).await })
+                block_on("pubsub", async move {
+                    svc.publish_durable(&cx, topic, json).await
+                })
             },
         );
     }
@@ -158,4 +160,3 @@ fn message_to_json(value: &Dynamic) -> Json {
     }
     Json::String(value.to_string())
 }
-