Show HN: Rigorix, Execution governance for AI agents, open-source engine

Rigorix is an open-source execution governance engine that revalidates authority at the moment a consequential AI-agent action would execute, refusing and signing the decision if authority has changed since approval. It records HMAC-signed, hash-chained evidence with Ed25519 checkpoints, and publishes verifiers on crates.io, npm and PyPI (five languages, with Java and Go in-repo) so third parties can check records offline. The engine is Apache-2.0/MIT Rust, with an enterprise control plane for policy, audit and shared capacity that configures and observes but never makes the enforcement decision.