feat: enable experimental agent teams in dev container

Author: sonesuke

.devcontainer/devcontainer.json

@@ -18,7 +18,8 @@
         "vscode": {}
     },
     "containerEnv": {
-        "Z_AI_API_KEY": "${localEnv:Z_AI_API_KEY}"
+        "Z_AI_API_KEY": "${localEnv:Z_AI_API_KEY}",
+        "CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS": "1"
     },
     "postCreateCommand": "bash .devcontainer/post-create.sh",
     "remoteUser": "vscode"