feat: simplify subject conversion composer

.memory/worklog.json

@@ -1,18 +1,5 @@
 {
   "entries": [
-    {
-      "files_changed": 5,
-      "hash": "18fd8c9",
-      "message": "auto-save 2026-05-18 06:33 (~5)",
-      "ts": "2026-05-18T06:33:24+08:00",
-      "type": "commit"
-    },
-    {
-      "files_changed": 1,
-      "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 1 项未提交变更 · 最近提交：auto-save 2026-05-18 06:33 (~5)",
-      "ts": "2026-05-17T22:33:44Z",
-      "type": "session-heartbeat"
-    },
     {
       "files_changed": 1,
       "hash": "58c3e5c",
@@ -3250,6 +3237,19 @@
       "message": "docs: record conversion composer deployment",
       "hash": "659ee10",
       "files_changed": 1
+    },
+    {
+      "ts": "2026-05-20T17:00:53+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-20 17:00 (~2)",
+      "hash": "eeb7186",
+      "files_changed": 2
+    },
+    {
+      "ts": "2026-05-20T09:05:30Z",
+      "type": "session-heartbeat",
+      "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 4 项未提交变更 · 最近提交：auto-save 2026-05-20 17:00 (~2)",
+      "files_changed": 4
     }
   ]
 }