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)
• Reconstructive retrieval windows (WG-120, E-mem-inspired)
• Execution-signature retrieval (WG-121, APEX-EM-inspired)
• Scope-before-search shard routing (WG-122, ShardMemo-inspired)

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;

pub use semantic_retriever::HybridHit;

pub use semantic_retriever::ScoreComponents;

pub use semantic_retriever::SemanticRetriever;

pub use shard::EpisodeMetadata;

pub use shard::RoutingResult;

pub use shard::ScopeFilter;

pub use shard::ShardConfig;

pub use shard::ShardRouter;

pub use shard::TimeRange;

pub use signature::ExecutionSignature;

pub use signature::QuerySignature;

pub use signature::SignatureConfig;

pub use signature::SignatureMatch;

pub use signature::SignatureMatcher;

pub use signature::StepPattern;

pub use windows::ContextWindow;

pub use windows::RetrievalHit;

pub use windows::WindowConfig;

pub use windows::WindowExpander;

pub use windows::WindowExpansionResult;

pub use windows::merge_overlapping_windows;

Modules

cache

Query Cache for Episodic Memory Retrieval

cascade

Cascading retrieval pipeline (WG-131).

gist

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

semantic_retriever

Hybrid semantic and keyword retrieval for episodic memory.

shard

Scope-before-search shard routing (WG-122).

signature

Execution-signature retrieval (WG-121).

windows

Reconstructive retrieval windows (WG-120).