uselesskey-core-keypair
Published-internal compatibility shim.
Shared PKCS#8/SPKI helper ownership moved into uselesskey-core. Existing
imports from this crate remain available during the compatibility-shim period:
use Pkcs8SpkiKeyMaterial;
Prefer the fixture-family crates (uselesskey-rsa, uselesskey-ecdsa,
uselesskey-ed25519) or the uselesskey facade for normal usage. The
canonical helper implementation now lives at uselesskey_core::srp::keypair.