Module embedding 

Embedding provider trait and mock implementation.

This module defines the EmbeddingProvider trait that abstracts over different embedding generation backends (fastembed, OpenAI, etc.).

Providers

• MockEmbeddingProvider: Deterministic fixed-dimension vectors for testing
• FastEmbedProvider: Local embedding via fastembed (requires vector-fastembed feature)

Structs

MockEmbeddingProvider

A mock embedding provider for testing.

Traits

EmbeddingProvider

Trait for generating text embeddings.