Adds a second regression test for AliroCrypto.deriveStepUpSessionKeys
that hard-codes the exact RFC 5869 reference computation (empty salt,
"SKDevice" / "SKReader" ASCII info) with a different IKM byte pattern
and independent expand-once helper. Complements the existing
deriveStepUpSessionKeysMatchesManualHkdf so a future spec misread in
shared helper code can't slip through.
Implementation itself was landed earlier in f94e416 ("fix: AUTH1 crypto
interop with stock X-CUBE-ALIRO + EXCHANGE compat stub"); this is the
M1A.1 task's tightened pin from the Step-Up v2 plan.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
cedefef70e