sk_v4_identity_offer_wait() beats until a stick that is not this system's arrives (offered), a key is pressed, or the system stick leaves; sk_v4_identity_recheck_offered() runs the arrival check again once the mint has written it. Builds on three ISAs; not yet called. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2