Allow replies during room creation cooldowns

tests/chat-service-cooldown.test.ts

@@ -115,6 +115,35 @@ describe('ChatService invitation cooldown', () => {
     expect(result).toBe(false);
   });
 
+  it('allows replies in existing rooms during a room-creation cooldown', async () => {
+    const { svc, matrix } = buildService();
+    matrix.sendTextMessage = async () => '$reply';
+    svc.setInvitationCooldown(
+      new MatrixRateLimitError(
+        '429',
+        60_000,
+        'M_LIMIT_EXCEEDED',
+        'rate.room_creation_limit',
+      ),
+    );
+    // Simulate a cooldown persisted before operation scopes were recorded.
+    delete svc.getInvitationCooldown()!.scope;
+
+    await expect(svc.sendChatMessage('!room:example.test', 'hi')).resolves.toBe(true);
+  });
+
+  it('treats a generic limit raised while creating a room as room-creation-only', async () => {
+    const { svc, matrix } = buildService();
+    matrix.sendInitialDirectMessage = async () => {
+      throw new MatrixRateLimitError('429', 60_000, 'M_LIMIT_EXCEEDED', null);
+    };
+    matrix.sendTextMessage = async () => '$reply';
+
+    await expect(svc.startConversationDetailed('someuser', 'opener', 't2_someuser'))
+      .resolves.toMatchObject({ status: 'retryable' });
+    await expect(svc.sendChatMessage('!room:example.test', 'reply')).resolves.toBe(true);
+  });
+
   it('persists the cooldown to disk and restores it after a fresh service load', async () => {
     const logger = createMockLogger();
     const tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'chat-cooldown-'));