butler-git: Turning “I’m Done” Into a Verifiable Fact

`butler-git` is a DSH plugin designed to address the difficulty of distinguishing “intent” from “completion” in agent workflows. It uses Git-native mechanisms to decouple nodes (intent) from commits (evidence) and introduces zero-dependency gates to enforce consistency. Core features include separating intent declarations from commit validation and performing strict checks with Delta and Program ($P$); using a credential system to implement downward-inclusive permissions; freezing committed nodes to make them immutable; and providing DAG graphs and evidence chains for visualization and audit. The tool is well suited to projects highly sensitive to changes, ensuring that work products are replayable and auditable.