Function fetchOidcDiscovery

fetchOidcDiscovery(issuerUrl: string): Promise<OidcDiscoveryDocument>
Fetches an OIDC discovery document from the well-known endpoint.

Always makes a network request — does NOT use the cache. Prefer getOidcDiscovery for cached access.
Parameters
- issuerUrl: string
  OIDC issuer URL (e.g. https://auth.example.com)
Returns Promise<OidcDiscoveryDocument>
Parsed and validated discovery document

Throws
If the fetch fails or required fields are missing
- Defined in src/server/auth/oidc-discovery.ts:188