Use void operator for getter side-effect access in tests (S1481)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/stores/conformance.test.js

@@ -204,7 +204,7 @@ describe("conformanceStore", () => {
           attributes: [],
         },
       ];
-      const _accessed = store.cases;
+      void store.cases;
       // Original state should still contain the ISO date
       expect(store.allCases[0].started_at).toBe(originalDate);
     });