feat(expiry): telemetry 2 events — expired_banner_shown / expired_batch_trash (#5 v0.2.3)

tests/unit/telemetryStats.test.ts

@@ -101,3 +101,26 @@ describe('aggregateStats — trash family (v0.2.3 #4)', () => {
     expect(r.md).toContain('휴지통 회수율: N/A');
   });
 });
+
+describe('aggregateStats — expired_banner_shown / expired_batch_trash', () => {
+  it('counts both kinds per day and computes 만료 trash ratio', () => {
+    const events = [
+      { ts: '2026-05-01T00:00:00.000Z', kind: 'expired_banner_shown' as const, payload: { candidateCount: 5 } },
+      { ts: '2026-05-01T01:00:00.000Z', kind: 'expired_banner_shown' as const, payload: { candidateCount: 3 } },
+      { ts: '2026-05-01T02:00:00.000Z', kind: 'expired_batch_trash' as const, payload: { count: 4 } }
+    ];
+    const r = aggregateStats(events, new Date('2026-05-02T00:00:00Z'));
+    expect(r.md).toContain('expired_banner_shown');
+    expect(r.md).toContain('expired_batch_trash');
+    // 4 / (5 + 3) = 50.0%
+    expect(r.md).toMatch(/만료 trash ratio.*50\.0%/);
+  });
+
+  it('shows N/A when 만료 배너 노출 0건', () => {
+    const events = [
+      { ts: '2026-05-01T00:00:00.000Z', kind: 'capture' as const, payload: { noteId: 'a', rawTextLength: 1, hasMedia: false } }
+    ];
+    const r = aggregateStats(events, new Date('2026-05-02T00:00:00Z'));
+    expect(r.md).toMatch(/만료 trash ratio.*N\/A/);
+  });
+});