nx_citation_registry_test.nx

nx_citation_registry_test.nx -- the LIBRARIAN ingests the roadmap's research references and guards them against link-rot, license-permitting: 1. every reference must carry a STABLE anchor (venue+year / book / doc# / in-tree path) -- never a bare URL. Rot-proof by construction. 2. classify each reference's LICENSE. OPEN (arXiv/CC/GPL/public) -> INGEST the content into our store by hash (a local, integrity-checkable, rot-proof copy). RESTRICTED (copyrighted/paywalled/vendor) -> METADATA-ONLY (we hold the permanent anchor but do NOT mirror what we may not -- license boundary). 3. prove the ingest path: hash an OPEN (GPL kernel-doc) excerpt -> store key, re-hash -> identical (the held copy is addressable + integrity-checkable). A synthetic URL-only reference must be CAUGHT as rot-risk (detector validated). Known answer: all real refs stable + license-classified; OPEN ones ingestible; RESTRICTED ones metadata-only; the synthetic URL flagged. exit 0.