authenticationserviceslisted

# AuthenticationServices — Foundations Skill ## Purpose Route Sign in with Apple implementation tasks to the minimum required AuthenticationServices Knowledge Contracts. v1 scope is the `ASAuthorizationAppleIDProvider`/`ASAuthorizationController` Sign in with Apple flow only — no Password AutoFill/credential-provider extensions, no Passkeys/WebAuthn APIs, no server-side identity-token verification. ## Routing Load only the contracts relevant to the task. All paths relative to knowledge/authenticationservices/. - Building an `ASAuthorizationAppleIDRequest` via `createRequest()`, setting `requestedScopes`, driving `ASAuthorizationController` through its delegate/presentation-context protocols, or reading `user`/`fullName`/`email`/`identityToken`/`authorizationCode`/`ASAuthorizationError` from the result -> sign-in-with-apple-request-and-credential.md - Generating/hashing a nonce, or forwarding `identityToken`/`authorizationCode` to a backend -> nonce-and-identity-token-verification.md - Calling `getCredentialState(forUserID:)`, branching on `.authorized`/`.revoked`/`.notFound`/`.transferred`, or observing `credentialRevokedNotification` -> credential-state-and-revocation.md - Deciding what to persist for a signed-in session, or sign-out behavior -> session-persistence-and-sign-out.md Never load more than the contracts relevant to the specific question. ## Stop Conditions Stop and report if the requested topic has no matching Knowledge Contract in knowledge/authe