style: apply nix fmt

hive-claude/src/driver.rs

@@ -58,7 +58,10 @@ impl Claude {
             })?;
 
         if let Some(mut stdin) = child.stdin.take() {
-            stdin.write_all(prompt.as_bytes()).await.map_err(Error::Stdin)?;
+            stdin
+                .write_all(prompt.as_bytes())
+                .await
+                .map_err(Error::Stdin)?;
             // Best-effort flush/close; claude sees EOF and starts the turn.
             stdin.shutdown().await.ok();
         }