{
  "error": { "code": "NOT_FOUND", "message": "No resource at this path." },
  "sitemap": [
    { "path": "/", "method": "GET", "description": "human-facing FX-rate fairness calculator", "auth_required": false },
    { "path": "/.well-known/add.json", "method": "GET", "description": "discovery manifest — start here", "auth_required": false },
    { "path": "/methodology.json", "method": "GET", "description": "exact calculation formula and thresholds", "auth_required": false },
    { "path": "/feedback", "method": "GET", "description": "feedback channel status", "auth_required": false },
    { "path": "/.well-known/pentest-authorization.json", "method": "GET", "description": "signed security-testing authorization grant, if currently published", "auth_required": false }
  ],
  "ui": {
    "title": "Not Found",
    "message": "Here are the available endpoints. Start at /.well-known/add.json if you're an agent orienting from the root URL alone."
  }
}