Companion to plans/fed-sx-host-types.md. Build sheet for the deferred
lib/host adapter slice (fed_sx_outbox / fed_sx_inbox): projects the
host's existing type-post metamodel (blog.sx: :cid, :schema, subtype-of
graph) onto the fed-sx DefineType/SubtypeOf verbs, ingests peers' types
into peer_types, validates inbound typed objects via
pipeline:apply_object_schema/2, and serves GET /types/<cid>.
Surfaces the two gating decisions for loops/host: the SX-host <->
Erlang-on-SX runtime boundary (recommends an HTTP boundary to dodge the
er-scheduler gen_server:call deadlock) and the type-CID identity choice.
Scope is the inverse of this loop: lib/host/** only, no next/ edits.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
giles
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