feat(pairing): add PairingStore interface for persistence injection

src/channels/pairing.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
-import { PairingManager } from './pairing.js';
+import { PairingManager, type PairingStore } from './pairing.js';
 
 describe('PairingManager', () => {
   let manager: PairingManager;
@@ -156,4 +156,56 @@ describe('PairingManager', () => {
     });
     expect(disabled.enabled).toBe(false);
   });
+
+  describe('PairingManager with store', () => {
+    it('calls store.saveApproved when a code is validated', () => {
+      const store: PairingStore = {
+        loadApproved: () => [],
+        saveApproved: vi.fn(),
+        removeApproved: vi.fn(),
+      };
+      const mgr = new PairingManager({ enabled: true, codeTtl: 300_000, codeLength: 6 }, store);
+      const code = mgr.generateCode();
+      mgr.validateCode('telegram', '123', code);
+      expect(store.saveApproved).toHaveBeenCalledWith(expect.objectContaining({
+        channel: 'telegram',
+        senderId: '123',
+      }));
+    });
+
+    it('calls store.removeApproved when approval is revoked', () => {
+      const store: PairingStore = {
+        loadApproved: () => [],
+        saveApproved: vi.fn(),
+        removeApproved: vi.fn(),
+      };
+      const mgr = new PairingManager({ enabled: true, codeTtl: 300_000, codeLength: 6 }, store);
+      const code = mgr.generateCode();
+      mgr.validateCode('telegram', '123', code);
+      mgr.revokeApproval('telegram', '123');
+      expect(store.removeApproved).toHaveBeenCalledWith('telegram', '123');
+    });
+
+    it('loads approved senders from store on construction', () => {
+      const store: PairingStore = {
+        loadApproved: () => [
+          { channel: 'telegram', senderId: '111', approvedAt: Date.now(), codeUsed: 'AAAAAA' },
+          { channel: 'discord', senderId: '222', approvedAt: Date.now(), codeUsed: 'BBBBBB' },
+        ],
+        saveApproved: vi.fn(),
+        removeApproved: vi.fn(),
+      };
+      const mgr = new PairingManager({ enabled: true, codeTtl: 300_000, codeLength: 6 }, store);
+      expect(mgr.isApproved('telegram', '111')).toBe(true);
+      expect(mgr.isApproved('discord', '222')).toBe(true);
+      expect(mgr.listApproved()).toHaveLength(2);
+    });
+
+    it('works without a store (backward-compatible)', () => {
+      const mgr = new PairingManager({ enabled: true, codeTtl: 300_000, codeLength: 6 });
+      const code = mgr.generateCode();
+      mgr.validateCode('telegram', '123', code);
+      expect(mgr.isApproved('telegram', '123')).toBe(true);
+    });
+  });
 });