Improve messaging and dashboard reliability

tests/matrix-client.test.ts

@@ -2,6 +2,7 @@ import { describe, it, expect, vi } from 'vitest';
 import {
   MatrixAuthError,
   MatrixClient,
+  MatrixFeatureDisabledError,
   MatrixRateLimitError,
 } from '../src/services/chat/matrix/client.js';
 import { createMockLogger } from './mockLogger.js';
@@ -153,6 +154,18 @@ describe('MatrixClient direct room registration', () => {
 });
 
 describe('MatrixClient authentication classification', () => {
+  it('classifies an explicitly disabled endpoint as an unavailable feature', async () => {
+    const client = new MatrixClient(creds, createMockLogger(), {
+      minRequestIntervalMs: 0,
+      fetchImpl: vi.fn().mockResolvedValue(new Response(JSON.stringify({
+        message: 'disabled by configuration',
+      }), { status: 403, headers: { 'content-type': 'application/json' } })),
+    });
+
+    await expect(client.getRoomFullState('!room:example.test'))
+      .rejects.toBeInstanceOf(MatrixFeatureDisabledError);
+  });
+
   it('does not classify a room-level 403 as an expired account token', async () => {
     const client = new MatrixClient(creds, createMockLogger(), {
       minRequestIntervalMs: 0,