fix: address code review findings

internal/routing/graph_test.go

@@ -398,10 +398,10 @@ func TestRouteReSearchOnChange(t *testing.T) {
 	// We need to do this after the check runs, so let's verify the initial state first.
 
 	// Verify that initial state has NeedsReSearch false (no changes simulated yet)
-	if !itinerary.NeedsReSearch {
-		t.Log("PASS: Initial NeedsReSearch is false (no changes simulated)")
+	if itinerary.NeedsReSearch {
+		t.Errorf("expected initial NeedsReSearch to be false, got true")
 	} else {
-		t.Log("INFO: Initial NeedsReSearch is already true")
+		t.Log("PASS: Initial NeedsReSearch is false (no changes simulated)")
 	}
 
 	// Now simulate cancellation by setting edge s1->s2 duration to > 86400 (1 day = cancellation)