fix(agent-office): Telegram HTML escape + 4096자 제한 + 실패 원인 로깅

agent-office/app/telegram/formatter.py

@@ -1,4 +1,5 @@
 """에이전트 메시지 포맷팅."""
+from html import escape as _h
 from typing import Literal, Optional
 
 from .agent_registry import get_agent_meta
@@ -23,9 +24,14 @@ def format_agent_message(
 ) -> str:
     meta = get_agent_meta(agent_id)
     icon = KIND_ICONS.get(kind, "")
-    header = f"{icon} <b>[{meta['emoji']} {meta['display_name']}]</b> {title}"
+    header = f"{icon} <b>[{_h(meta['emoji'])} {_h(meta['display_name'])}]</b> {_h(title)}"
 
-    lines = [header, "━" * 20, body]
+    # Telegram 단일 메시지 4096자 제한 대응 (헤더/푸터 여유 512자 확보)
+    safe_body = _h(body)
+    if len(safe_body) > 3500:
+        safe_body = safe_body[:3500] + "\n…(생략)"
+
+    lines = [header, "━" * 20, safe_body]
 
     if metadata:
         footer_parts = []
@@ -38,6 +44,6 @@ def format_agent_message(
             footer_parts.append(f"🤖 {metadata['model']}")
         if footer_parts:
             lines.append("")
-            lines.append(f"<i>{' · '.join(footer_parts)}</i>")
+            lines.append(f"<i>{_h(' · '.join(footer_parts))}</i>")
 
     return "\n".join(lines)