feat: CAPA effectiveness re-check cron — 30/60/90-day email + WhatsApp notifications

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFDuBhMKvoWjrWT3ZnGmmr

tests/lib/notifications/effectiveness-recheck.test.ts

@@ -0,0 +1,51 @@
+import { describe, it, expect } from 'vitest'
+import {
+  getNextRecheckDate,
+  shouldSendRecheck,
+  getRoundLabel,
+} from '@/lib/notifications/effectiveness-recheck'
+
+describe('getRoundLabel', () => {
+  it('returns "30-day" for round 0', () => {
+    expect(getRoundLabel(0)).toBe('30-day')
+  })
+  it('returns "60-day" for round 1', () => {
+    expect(getRoundLabel(1)).toBe('60-day')
+  })
+  it('returns "90-day" for round 2', () => {
+    expect(getRoundLabel(2)).toBe('90-day')
+  })
+})
+
+describe('getNextRecheckDate', () => {
+  // verifiedAt 2026-07-01. July has 31 days.
+  // +60d → July 1 + 60 = Aug 30
+  // +90d → July 1 + 90 = Sep 29
+  it('returns 60d from verifiedAt when round 0 just sent', () => {
+    expect(getNextRecheckDate('2026-07-01T00:00:00Z', 0)).toBe('2026-08-30')
+  })
+  it('returns 90d from verifiedAt when round 1 just sent', () => {
+    expect(getNextRecheckDate('2026-07-01T00:00:00Z', 1)).toBe('2026-09-29')
+  })
+  it('returns null when round 2 just sent (all done)', () => {
+    expect(getNextRecheckDate('2026-07-01T00:00:00Z', 2)).toBeNull()
+  })
+})
+
+describe('shouldSendRecheck', () => {
+  it('true when date equals today and round < 3', () => {
+    expect(shouldSendRecheck('2026-07-11', 0, '2026-07-11')).toBe(true)
+  })
+  it('true when date is in the past and round < 3', () => {
+    expect(shouldSendRecheck('2026-07-10', 2, '2026-07-11')).toBe(true)
+  })
+  it('false when round is 3 (all done)', () => {
+    expect(shouldSendRecheck('2026-07-10', 3, '2026-07-11')).toBe(false)
+  })
+  it('false when recheckDate is null', () => {
+    expect(shouldSendRecheck(null, 0, '2026-07-11')).toBe(false)
+  })
+  it('false when date is in the future', () => {
+    expect(shouldSendRecheck('2026-07-20', 0, '2026-07-11')).toBe(false)
+  })
+})