test: avoid wall-clock assertions in import budget regressions

crates/kernel/src/step_in/tests.rs

@@ -644,10 +644,9 @@ fn knot_multiplicities_are_checked_before_they_are_expanded() {
         let cx = Ctx { ex: &ex, len: 1.0, ang: 1.0, tol: 1e-6 };
         geom::curve(&cx, 3, 0)
     };
-    let t = std::time::Instant::now();
     let error = read(&curve(1_000_000, 64)).unwrap_err();
+    // This diagnostic comes from the check before expansion; wall-clock time depends on CI load.
     assert!(error.contains("knot multiplicities do not match"), "{error}");
-    assert!(t.elapsed() < std::time::Duration::from_secs(5), "took {:?}", t.elapsed());
     // A degree-1 curve with two control points needs exactly four knot values.
     assert!(read(&curve(2, 2)).is_ok());
     assert!(read(&curve(4, 1)).is_ok());