feat: persist settings and enrich conversation context

tests/matrix-http-media-downloader.test.ts

@@ -0,0 +1,25 @@
+import { describe, expect, it, vi } from 'vitest';
+import { MatrixMediaDownloader } from '../src/services/chat/matrix/http-media-downloader.js';
+import { createMockLogger } from './mockLogger.js';
+
+describe('MatrixMediaDownloader', () => {
+  it('uses replacement Matrix credentials for subsequent media downloads', async () => {
+    const staleClient = { downloadMedia: vi.fn().mockRejectedValue(new Error('expired')) };
+    const freshClient = {
+      downloadMedia: vi.fn().mockResolvedValue({
+        bytes: Buffer.from('fresh-image'),
+        contentType: 'image/jpeg',
+      }),
+    };
+    const downloader = new MatrixMediaDownloader(staleClient as never, createMockLogger());
+
+    downloader.setMatrixClient(freshClient as never);
+
+    await expect(downloader.fetch('mxc://reddit.com/image')).resolves.toEqual({
+      buffer: Buffer.from('fresh-image'),
+      contentType: 'image/jpeg',
+    });
+    expect(staleClient.downloadMedia).not.toHaveBeenCalled();
+    expect(freshClient.downloadMedia).toHaveBeenCalledWith('mxc://reddit.com/image');
+  });
+});