Added runtime tests and validation

Property	Value
description	Added build, unit test, and stdio smoke validation for the MAC MCP runtime.
version	0.2.0
type	Create
related	MAC MCP

• Added unit tests for registry, docs, release-log, governance context, and path-confinement behavior.
• Added a stdio MCP smoke test that starts the server and verifies the advertised tool surface.
• Added npm run build, npm test, and npm run check scripts.