tsift-memgraphrag

MemGraphRAG graph projection and retrieval layer for tsift.

This crate owns the graph/RAG side of first-party memory:

• decay-weighted memory ranking and query packet contracts,
• projection of tsift-memory events into GraphProjection rows with explicit recent-first, oldest-first, and query-relevant read policies,
• upsert of .tsift/memory.db into the shared graph store,
• memory projection metadata nodes carrying read policy, source watermark, and content hash proof,
• traversal refresh rows for memory/session/source/semantic retrieval,
• ontology derivation over the shared graph store.

tsift-memory remains the durable event database and import substrate. This crate depends on it; tsift-memory does not depend back on MemGraphRAG.

Local KG Model Contract

tsift-memgraphrag consumes the shared local KG contract from ../../specs/local-kg-model.md. It must keep tsift-local-hash-v1 as the deterministic fallback, but semantic extraction and embedding providers should plug in through tsift-kg/tsift-local-model contracts instead of hard-coding a model runtime in this crate.

Projected KG facts must remain normal GraphProjection nodes and edges with tsift-kg provenance, source watermarks, content hashes, and run manifest references so repeated local model runs can be compared without duplicating unchanged graph facts.