nx_trace_query.nx

nx_trace_query.nx -- filter / count / project over CBOR span streams. Layer 3 of the sovereign-log roadmap. Operates on a raw CBOR span buffer (n bytes of back-to-back nx_cbor_emit_span output). The caller decides the source: live in-memory chunk_buf, a flushed nx_log_chunked chunk's bytes, a memory-mapped on-disk file, or a concatenated multi-chunk read. Query layer doesn't care about storage layout -- it walks bytes. Design rationale: stream-walk per query keeps the primitive small (no internal indexing) and avoids the LSM-tree compaction problem for v1. When a query becomes hot, an index can land at Layer 4 (bloom filter + segment summary) without changing this API. Per the build-the-engine-not-instances cardinal: this primitive scales any future projection without per-projection code. genealogy_id: cqrs_event_sourcing + opentelemetry_query lineage_id: substrate_trace_query_v1