feat(lotto-signals): urgent 텔레그램 발송 + throttle/cap + daily digest 발송 + baseline_mu/sigma 노출

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent-office/app/notifiers/telegram_lotto.py

@@ -88,10 +88,11 @@ def _format_urgent_signal(event: Dict[str, Any]) -> str:
         mu = r.get("baseline_mu")
         sigma = r.get("baseline_sigma")
         z = r.get("z_score")
+        v_text = f"{v:.2f}" if v is not None else "N/A"
         if mu is not None and sigma is not None and z is not None:
-            lines.append(f"• {label} {v:.2f} (μ={mu:.2f}, σ={sigma:.2f}) z={z:.1f}")
+            lines.append(f"• {label} {v_text} (μ={mu:.2f}, σ={sigma:.2f}) z={z:.1f}")
         else:
-            lines.append(f"• {label} {v:.2f}")
+            lines.append(f"• {label} {v_text}")
 
     # drift 페이로드 — 어떤 전략이 변동했는지 한 줄
     for r in fired: