D1 thin dir+git with shard-wiki then kontextual upgrade path; D2 defer
asset-store; D3 NetKingdom authz consolidation; D4 outline explode/implode
and live-by-default includes with pin as exception.
Document coulomb layering (NetKingdom, Railiance, PageOps, markitect-tool),
compare thin store vs shard-wiki vs kontextual-engine, and outline asset-store
extraction from kontextual BlobStorage. Include executable spike checklist.