Record the full reasoning path (GraphQL service, Arrow Flight, raw SSH,
forced-command synthesis) and specify read-only enforcement as five
fail-safe layers: key-per-operation, SELECT-only statement gate,
read-only OS user, engine hardening, resource caps. Promote 'SQL is
the contract' to a top-level design principle.
Replace object-store replication with rsync over persistent multiplexed
SSH (ed25519, pinned known_hosts, forced commands as the only remote
API); demote GraphQL to the ground integration standard. Add DuckDB
spatial extension for separation audits, perimeter predicates and
trajectory analysis in the local planar frame.