skm-embed

Embedding abstraction layer for Agent Skills.

This crate provides:

• EmbeddingProvider trait for pluggable backends
• Embedding struct with similarity operations
• SkillEmbeddings for multi-component weighted embeddings
• EmbeddingIndex for persistent, queryable skill embeddings
• Providers: BGE-M3, MiniLM (local), OpenAI/Cohere/Compatible (API)