{
  "user_roles": {
    "alice": ["admin", "developer"],
    "bob": ["developer"],
    "charlie": ["guest"]
  },
  "role_grants": {
    "admin": [
      {"action": "read", "type": "any"},
      {"action": "write", "type": "any"}
    ],
    "developer": [
      {"action": "read", "type": "code"},
      {"action": "write", "type": "code"}
    ],
    "guest": [
      {"action": "read", "type": "docs"}
    ]
  }
}