skills-ref: Agent Skills Reference Library

The `skills-ref` library serves as a foundational reference for the Agent Skills open specification, enabling AI agents to dynamically discover, load, and execute specialized capabilities. It defines the structure and format for 'skills,' which are modular packages of instructions, scripts, and resources for AI agents. Currently at version 0.1.1, its development is closely tied to Anthropic's Agent Skills initiative, with active releases focusing on refining the underlying specification.