REVERT(app): restore execute_bash to execute_host

- Fix kubectl execution failure inside Pod
- Use nsenter to access host kubectl
- Keep natural language responses and storage/memory distinction

deploy/k8s/overlays/prod/kustomization.yaml

@@ -14,5 +14,5 @@ commonLabels:
 # 이미지 태그 설정 (ArgoCD Image Updater가 자동으로 업데이트)
 images:
   - name: gitea0213.kro.kr/bluemayne/mas
-    newTag: main-sha-de29acaace047feffd9c49df79e7790b36aef91f
+    newTag: main-sha-4540d656562ef88176191cf8e9662a63e1176657
 

services/backend/agents/research_agent.py

@@ -37,11 +37,11 @@ User wants deployment decision
 - Provide structured findings
 
 ## Request commands in JSON:
-{"commands": [{"tool": "execute_bash", "command": "kubectl get nodes"}]}
+{"commands": [{"tool": "execute_host", "command": "kubectl get nodes", "use_sudo": true}]}
 
 Rules:
 - Request 1-2 commands at a time
-- Use execute_bash for kubectl commands (kubectl is installed in the container)
+- Use execute_host for kubectl commands (with use_sudo: true)
 - Output ONLY JSON when requesting commands
 - For storage queries, use: kubectl get pvc, df -h, du -sh
 - For memory queries, use: kubectl top nodes, kubectl top pods