test(config-audit): extend grade-stability test to assert Token Efficiency A/B on baseline

plugins/config-audit/tests/scanners/posture-grade-stability.test.mjs

@@ -42,4 +42,11 @@ describe('posture grade stability — baseline-all-a', () => {
       assert.equal(s.counts.high, 0, `${s.scanner} has ${s.counts.high} high findings`);
     }
   });
+
+  it('Token Efficiency area scores grade A or B on baseline', () => {
+    const te = result.areas.find(a => a.id === 'token_efficiency');
+    assert.ok(te, 'expected token_efficiency area to be present');
+    assert.ok(['A', 'B'].includes(te.grade),
+      `Token Efficiency grade is ${te.grade}, expected A or B (score=${te.score})`);
+  });
 });