nx_primitive_registry.nx

nx_primitive_registry.nx -- callable-by-name primitive catalog. Per user 2026-05-15: "actually ingest and use all the algorithms known as primitives as callable elements like functions like other systems". THE PATTERN (NumPy / SciPy / Mathematica / MATLAB): - Every primitive has a stable name (string) - The catalog records (name, signature_id, domain, complexity, provenance), enabling discovery and introspection - Lookup-by-name returns a stable IntID; downstream code dispatches by ID for performance - Per-domain query lets the user enumerate "what physics primitives are available?" NOTE: NishiLang doesn't yet have first-class function pointers in the user-source surface, so the registry stores METADATA + a stable dispatch_id. Caller chooses to invoke by direct symbol name (the fast path -- L3 callable) OR via the dispatcher (the slow but uniform path). Adding first-class fn pointers is a named blocker for full Mathematica-style Symbolic[] dispatch and is on the compiler-improvements queue.