dominicrume/cantor8_kya_rails: SPEC.md

# KYA Receipt Chain, version 1.0 A wire format for **tamper-evident receipts of agent actions, including the actions that were refused.** Status: stable. Reference implementations: [`kya_chain.py`](step-2-agent/kya_chain.py) (Python, stdlib only) and [`verifier.html`](step-3-verify/verifier.html) (b