Show HN: Governor, a firewall for AI agent spend and tool calls

Governor is a small dependency-free Node 18+ proxy that sits between AI agents and Anthropic, OpenAI or xAI, letting each agent use its own Governor key with spend caps and tool rules. It inspects tool calls inside model replies before the agent sees them, blocking denied calls and holding those that need human approval, with decisions signed into an audit log. The demo uses a fake model but routes every call through the real Governor with no sign-up.