feat: persist settings and enrich conversation context

tests/matrix-username-resolver.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it, vi } from 'vitest';
+import { MatrixUsernameResolver } from '../src/services/chat/matrix/username-resolver.js';
+
+describe('MatrixUsernameResolver', () => {
+  it('resolves Reddit t2 IDs from authenticated Matrix profile display names', async () => {
+    const getUserProfile = vi.fn(async (mxid: string) => {
+      const profiles: Record<string, { displayname?: string }> = {
+        '@t2_26q364ua7n:reddit.com': { displayname: 'MilkyBabe_10' },
+        '@t2_j8e83d38:reddit.com': { displayname: 'IssueLesss' },
+      };
+      return profiles[mxid] ?? {};
+    });
+    const resolver = new MatrixUsernameResolver({ getUserProfile });
+
+    await expect(
+      resolver.resolveT2Ids(['t2_26q364ua7n', 'j8e83d38']),
+    ).resolves.toEqual({
+      t2_26q364ua7n: 'MilkyBabe_10',
+      t2_j8e83d38: 'IssueLesss',
+    });
+    expect(getUserProfile).toHaveBeenCalledWith('@t2_26q364ua7n:reddit.com');
+    expect(getUserProfile).toHaveBeenCalledWith('@t2_j8e83d38:reddit.com');
+  });
+
+  it('ignores missing and t2-shaped display names without failing the batch', async () => {
+    const getUserProfile = vi.fn(async (mxid: string) => {
+      if (mxid === '@t2_missing:reddit.com') throw new Error('not found');
+      return { displayname: 't2_unresolved' };
+    });
+    const resolver = new MatrixUsernameResolver({ getUserProfile });
+
+    await expect(
+      resolver.resolveT2Ids(['t2_missing', 't2_unresolved']),
+    ).resolves.toEqual({});
+  });
+
+  it('uses replacement Matrix credentials for subsequent profile requests', async () => {
+    const staleClient = { getUserProfile: vi.fn().mockRejectedValue(new Error('expired')) };
+    const freshClient = {
+      getUserProfile: vi.fn().mockResolvedValue({ displayname: 'alice' }),
+    };
+    const resolver = new MatrixUsernameResolver(staleClient);
+
+    resolver.setMatrixClient(freshClient);
+
+    await expect(resolver.resolveT2Ids(['t2_alice'])).resolves.toEqual({ t2_alice: 'alice' });
+    expect(staleClient.getUserProfile).not.toHaveBeenCalled();
+    expect(freshClient.getUserProfile).toHaveBeenCalledWith('@t2_alice:reddit.com');
+  });
+});