Gap analysis from the five-subsystem set (acl/feed/flow/mod/search):
- store-on-sx: event-sourcing foundation the others fake with in-memory lists (build first)
- commerce-on-sx: catalog/cart/pricing/orders on miniKanren (+ store + flow)
- identity-on-sx: OAuth2/sessions/membership on Erlang (the core acl assumes)
- content-on-sx: documents/blocks/CRDT on Smalltalk
- events-on-sx: calendar/ticketing on Datalog + flow-driven delivery
- host-on-sx: the web boundary — off Quart onto native server+SXTP now, dream-on-sx next
All DRAFT outlines; substrate choices proposed, not final.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
