fn resolve_fallback_access_token(
env_var: impl FnOnce() -> Option<String>,
persist: impl FnOnce(&str),
stored: impl FnOnce() -> Option<String>,
) -> Option<String>Expand description
Pure resolution-order logic backing steps 2/3 of resolve_access_token,
factored out so it is unit-testable without touching a real OS keychain
(identity::secret_store wraps the keyring crate directly with no
mockable seam, so tests inject plain closures here instead).