Bernstein: a deterministic, open-source governance layer for AI agents

Bernstein is a deterministic orchestrator that runs a crew of CLI coding agents (Claude Code, Codex, Gemini CLI, and 40+ more) against a single goal in per-task git worktrees. There is no model in the coordination loop, so replay of yesterday's plan reproduces yesterday's task graph byte-identically. Every step carries signed lineage, and an opt-in HMAC-SHA256 audit chain covers every scheduling decision. Verification splits by key material: the Ed25519 signature legs and the Merkle seal check from the on-disk artefacts alone, while replaying the HMAC chain needs the install's audit key.