style(simulation): cargo fmt on the step-canvas batch

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

server/src/atlas/gen_queue.rs

@@ -383,7 +383,11 @@ impl GenWorkItem {
     /// update to the same one. `None` for every other variant.
     pub fn step_canvas_supersede_key(
         &self,
-    ) -> Option<(ConnectionId, &str, crate::atlas::step_canvas::StepCanvasRung)> {
+    ) -> Option<(
+        ConnectionId,
+        &str,
+        crate::atlas::step_canvas::StepCanvasRung,
+    )> {
         if let GenWorkItem::DeriveStepCanvas {
             body_id,
             conn_id,
@@ -1185,10 +1189,11 @@ fn run_work_item(
                 // ~45 ms run_layer1 re-derive, never pay it twice.
                 // body_params threads the real moisture ceiling into the
                 // T-1184 hydrology solve (merge seam resolution).
-                let (l1, ta) = terrain_cache
-                    .lock()
-                    .unwrap()
-                    .get_or_derive(body_id, &working, Some(body_params.as_ref()));
+                let (l1, ta) = terrain_cache.lock().unwrap().get_or_derive(
+                    body_id,
+                    &working,
+                    Some(body_params.as_ref()),
+                );
                 let climate = ClimateConstants::default();
                 let raw = crate::atlas::step_canvas::build_step_canvas(
                     *body_seed,