style(test): rustfmt the structural-divergence journey

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/picloud-cli/tests/structural_divergence.rs

@@ -109,7 +109,9 @@ fn divergence_refused_by_default_then_force_local_reparents() {
     assert!(!out.status.success(), "a divergence must refuse by default");
     let err = String::from_utf8_lossy(&out.stderr).to_lowercase();
     assert!(
-        err.contains("structural") || err.contains("force-local") || err.contains("different parent"),
+        err.contains("structural")
+            || err.contains("force-local")
+            || err.contains("different parent"),
         "the refusal must name the resolution flags:\n{err}"
     );
     assert_eq!(