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

collector.py

@@ -308,9 +308,11 @@ class CollectorBridge:
                             data = json.loads(f.read_text(encoding="utf-8-sig"))
                             project = data.get("project_name", self.project_name)
                             content = data.get("content", "")
-                            if content:
-                                await self.remote.asend_chat(project, content)
-                                logger.info(f"[COLLECTOR] → Gateway: chat snapshot len={len(content)}")
+                            attached_files = data.get("attached_files", [])
+                            if content or attached_files:
+                                await self.remote.asend_chat(project, content, attached_files=attached_files)
+                                af_info = f" +{len(attached_files)} files" if attached_files else ""
+                                logger.info(f"[COLLECTOR] → Gateway: chat snapshot len={len(content)}{af_info}")
                             f.unlink()  # Cleanup after forwarding
                         except (json.JSONDecodeError, OSError) as e:
                             logger.warning(f"[COLLECTOR] bad chat snapshot {f.name}: {e}")