Fix supervisor AI empty replies with fallback templates

Skip appending AI error strings to the session and use event-specific fallback commentary when the model returns empty content.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/hub_supervisor_lib.py

@@ -388,6 +388,56 @@ def event_tag(event_type: str) -> str:
     }.get(event_type, "监管")
 
 
+def _fmt_pnl_u(pnl: Any) -> str:
+    try:
+        v = float(pnl)
+        sign = "+" if v > 0 else ""
+        return f"{sign}{v:.4f}".rstrip("0").rstrip(".") + "U"
+    except (TypeError, ValueError):
+        return ""
+
+
+def build_supervisor_fallback_reply(event: dict, warnings: list[dict] | None = None) -> str:
+    """AI 不可用或返回空时的短评语（不展示错误文案）。"""
+    et = str(event.get("event_type") or "")
+    sym = str(event.get("symbol") or "—")
+    ex = str(event.get("exchange_name") or event.get("account_name") or "").strip()
+    pnl_txt = _fmt_pnl_u(event.get("pnl_amount"))
+    warn = (warnings or [])[:1]
+    warn_txt = str(warn[0].get("message") or "").strip() if warn else ""
+
+    if et == EVENT_PROGRAM_SL:
+        base = f"{sym} 程序止损"
+        if pnl_txt:
+            base += f"（{pnl_txt}）"
+        base += "，按计划出场是纪律。先歇一会儿，别急着马上再开。"
+    elif et == EVENT_PROGRAM_TP:
+        base = f"{sym} 程序止盈"
+        if pnl_txt:
+            base += f"（{pnl_txt}）"
+        base += "，执行不错。保持节奏，别立刻反手再开一单。"
+    elif et == EVENT_OPEN:
+        who = f"{ex} " if ex else ""
+        base = f"看到 {who}新开 {sym}。动手前确认是不是计划内，别因为上一笔情绪再开。"
+    elif et == EVENT_HUB_CLOSE:
+        base = f"中控平了 {sym}"
+        if pnl_txt:
+            base += f"（{pnl_txt}）"
+        base += "。"
+        base += f" {warn_txt}" if warn_txt else " 停一停，别连着手痒。"
+    elif et == EVENT_MANUAL_CLOSE:
+        base = f"手动平了 {sym}"
+        if pnl_txt:
+            base += f"（{pnl_txt}）"
+        base += "。"
+        base += f" {warn_txt}" if warn_txt else " 想好再开下一单。"
+    elif et == EVENT_FREQ_WARN:
+        base = warn_txt or "今日操作偏频繁，先休息一会儿。"
+    else:
+        base = "收到。确认是否按计划执行，别连续加码。"
+    return base.strip()[:320]
+
+
 def build_system_message(event: dict, *, trading_day: str, warnings: list[dict] | None = None) -> str:
     tag = event_tag(str(event.get("event_type") or ""))
     ex = event.get("exchange_name") or event.get("account_name") or "—"
@@ -611,11 +661,22 @@ def process_supervisor_tick(
                         trading_day=trading_day,
                         session_id=session_id,
                     )
-                    if reply and reply.strip():
-                        append_supervisor_ai_message(session_id, reply.strip())
+                    from hub_ai.text_util import is_ai_error_reply
+
+                    text = str(reply or "").strip()
+                    if not text or is_ai_error_reply(text):
+                        text = build_supervisor_fallback_reply(evt_snapshot, evt_warnings)
+                    if text:
+                        append_supervisor_ai_message(session_id, text)
                         _fire_notify()
                 except Exception:
-                    pass
+                    try:
+                        fb = build_supervisor_fallback_reply(evt_snapshot, evt_warnings)
+                        if fb:
+                            append_supervisor_ai_message(session_id, fb)
+                            _fire_notify()
+                    except Exception:
+                        pass
 
             threading.Thread(target=_ai_bg, daemon=True).start()