feat(bot/extension/watcher): Discord 아티팩트 알림 개선 — 파일 첨부 전송, truncation 확대, 동적 .md 감시

gateway.py

@@ -157,9 +157,10 @@ class GatewayAPI:
             data = await request.json()
             project = data.get("project_name", "")
             content = data.get("content", "")
+            attached_files = data.get("attached_files", [])
 
-            if not project or not content:
-                return web.json_response({"ok": False, "error": "project_name and content required"}, status=400)
+            if not project or (not content and not attached_files):
+                return web.json_response({"ok": False, "error": "project_name and content/attached_files required"}, status=400)
 
             # Write to chat_snapshots dir for bot's scanner
             snap_dir = self.bot.bridge.transport.bridge_dir / "chat_snapshots" if hasattr(self.bot.bridge.transport, 'bridge_dir') else None
@@ -172,12 +173,15 @@ class GatewayAPI:
                     "content": content,
                     "timestamp": time.time(),
                 }
+                if attached_files:
+                    snap_data["attached_files"] = attached_files
                 (snap_dir / f"{snap_id}.json").write_text(
                     json.dumps(snap_data, ensure_ascii=False, indent=2),
                     encoding="utf-8",
                 )
 
-            logger.info(f"[GATEWAY] chat received: project={project} len={len(content)}")
+            af_info = f" +{len(attached_files)} files" if attached_files else ""
+            logger.info(f"[GATEWAY] chat received: project={project} len={len(content)}{af_info}")
             return web.json_response({"ok": True})
         except Exception as e:
             logger.error(f"[GATEWAY] chat error: {e}")