Layered Architecture

Implemented

Interface, orchestration, workers, and stores. Runtime is not storage.

Framework03 05 06

Layers

Layer	AS-IS	TARGET
Interface	Next.js five-phase workspace	Same + experiment configuration UI
BFF	/api/sita/[...path]	Unchanged
Orchestration	FastAPI Decision Runtime	Same + streaming events
Workers	RQ ingest + classify	Optional GPU GNN worker
Stores	Postgres, Neo4j, R2, Redis	+ pgvector, catalogue DB