Introduce the framed guest_channel_transport with shared deadlines and
std::jthread ownership, metadata-only retired-schema quarantine with
fail-closed integrity, stateless frozen-catalog validators with
capability pinned to zero, and the generic local-service proxy with
descriptor-pinned endpoints, alias-only guest sockets, audit-gated
delivery, and a Linux managed runtime capability derived only from a
registry-bound operational factory. Sage vocabulary is confined to
src/adapters/sage.
Keep credentials and network access behind authenticated, audited brokers while binding launch adapters, immutable closures, recovery identities, receipts, and cleanup to the approved plan. Add Apple Container and Linux release lanes without weakening the outer sandbox.
