yadacoin-agent-auth-py

fix: use python-bitcoinlib instead of bitcoin package (v1.3.1)

feat: add validate_vp() for VP-based vendor authentication (v1.3.0)

fix: update stale did:yadacoin spec URL in README

test: add smoke tests for public API

chore: initial SDK scaffold — yadacoin-agent-auth v1.2.0