On-DevPlan

Storage hub for the nx-pn plugin platform: named backend registry, KV unit contract, stable error codes (dsh storage-family port)

JSON file KV storage backend for the nx-pn storage hub: single-document and per-record layouts, atomic publish (dsh storage-family port)

Schema-validated, change-emitting KV domains over nx-pn storage backends: defineDomain, single write chain, domain/changed events (dsh storage-family port)

SQLite storage backend (document-per-row KV) for the nx-pn storage hub, via node:sqlite (dsh storage-family port)