The Sergent Specification ships reference implementations in Rust, Go and Python on the same day

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sergentbuild published a language-agnostic rulebook plus working reference framework stacks on 2026-09-19, built on one rule: the model only proposes a change, and deterministic code validates, rehearses and commits it. The Rust implementation is four crates (core vocabulary with typed spec values and a canonical Proposal Schema, a runtime that drives one bounded Run from observation to commit, providers, and a public API), pinned to stable Rust 1.96.0 with a hermetic test suite verified on Windows x64, macOS arm64 and Linux x64. The README states the priority explicitly: when implementation and specification disagree, the implementation is wrong.