Memory backends

Episodic memory is pluggable. Configure with CARINA_MEMORY_BACKEND.

Backend	Env	Notes
builtin (default)	CARINA_MEMORY_BACKEND=builtin	Postgres + pgvector, or SQLite in local mode
postgres	Direct Postgres store	Same tables as builtin full mode
sqlite	CARINA_LOCAL_MODE=true	File at ~/.carina/data/memory.sqlite
honcho	HONCHO_API_KEY, HONCHO_URL	Honcho API
mem0	MEM0_API_KEY or MEM0_URL	Mem0 cloud or OSS

carina memory backends
carina memory use honcho
carina memory test

Implementation: src/memory/backends/. RAG vectors remain on Postgres when available; episodic recall routes through the active backend.