Module retrieval 

Episodic memory retrieval with caching and hybrid search.

This module provides efficient retrieval of episodes with:

• LRU caching and TTL for query results
• BM25 keyword search (via CSM crate, first-tier, no API calls)
• ConceptGraph ontology expansion (via CSM crate, synonym matching)
• HDC hyperdimensional vectors (via CSM crate)
• Cascading retrieval pipeline (WG-131)
• Hierarchical/gist reranking for dense context (WG-118)

Re-exports

pub use cache::CacheKey;

pub use cache::CacheMetrics;

pub use cache::DEFAULT_CACHE_TTL;

pub use cache::DEFAULT_MAX_ENTRIES;

pub use cache::QueryCache;

pub use cascade::CascadeConfig;

pub use cascade::CascadeResult;

pub use cascade::CascadeRetriever;

pub use gist::EpisodeGist;

pub use gist::GistExtractor;

pub use gist::GistScoredItem;

pub use gist::HierarchicalReranker;

pub use gist::RerankConfig;

Modules

cache

Query Cache for Episodic Memory Retrieval

cascade

Cascading retrieval pipeline (WG-131).

gist

Hierarchical/gist reranking for dense context retrieval (WG-118).