rag_server: read_publication finds the shipped originals, falls back to honest chunk reassembly; get_dataset_code resolves notebooks under the published layout (WP3)

pluggable embed models (factory + dim guard): rag_server.py

rerank on by default + dead-API latch: rag_server.py

rag_server: server-first Qdrant (QDRANT_URL fast path, embedded fallback) — 50/50 in 25s

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