nx_bprov_chain.nx

nx_bprov_chain.nx -- ergonomic wrappers over nx_bit_provenance. Cardinal: feedback-bit-provenance-systemic-auto-injection. The bit-provenance ledger primitive (nx_bit_provenance.nx) exposes alloc / emit / emit3 / join. Used directly, each producer site needs 2-3 lines of boilerplate: let id: i64 = nx_bprov_alloc() nx_bprov_emit(id, src_a, src_b, layer, tag) This wrapper collapses that into a single chain-call: let id: i64 = nx_bprov_chain2(layer, tag, src_a, src_b) Or for 3 sources: let id: i64 = nx_bprov_chain3(layer, tag, src_a, src_b, src_c) Or 0 sources (silicon-born input): let id: i64 = nx_bprov_chain0(layer, tag) These are the "born into what we build" half of the systemic answer. New substrate primitives use these in their main paths. The other half (retroactive injection on existing primitives) is the self-host IR pass per docs/NISHI_BPROV_AUTO_INJECTION_DESIGN.md.