Book-and-Claim Registry Sandbox

Demo sandbox, simplified from RSB-PRO-20-001 v3.2 and the RSB/Airbus “Practical Example” (June 2026) — not a production registry. Positioned as a partner/on-ramp to CADO: we teach the model, CADO runs the market. Every event below is appended to an append-only, hash-chained ledger — nothing is ever edited or deleted, only added.