feat: update codex live chat workflow

etc/servers/work-server/src/services/chat-room-service.test.ts

@@ -2,6 +2,7 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import {
   buildChatConversationRequestPatchFromMessage,
+  isVisibleConversationMessage,
   mergeChatConversationRequestStatus,
   shouldClearConversationJobState,
   selectChatConversationResponseCandidate,
@@ -26,6 +27,28 @@ test('buildChatConversationRequestPatchFromMessage ignores system progress messa
   );
 });
 
+test('isVisibleConversationMessage hides internal system messages and keeps activity logs', () => {
+  assert.equal(
+    isVisibleConversationMessage({
+      id: 1,
+      author: 'system',
+      text: '응답을 준비하고 있습니다.',
+      timestamp: '2026-04-22 10:00:00',
+    }),
+    false,
+  );
+
+  assert.equal(
+    isVisibleConversationMessage({
+      id: 2,
+      author: 'system',
+      text: '[[activity-log]]\n작업을 시작했습니다.',
+      timestamp: '2026-04-22 10:00:01',
+    }),
+    true,
+  );
+});
+
 test('buildChatConversationRequestPatchFromMessage builds user and codex request patches', () => {
   assert.deepEqual(
     buildChatConversationRequestPatchFromMessage({