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Runtime capability boundary
UE4SS is only a possible Companion-local implementation detail. It is not a feature gate: no SCUM game, database, UE4SS build, or source revision controls plugin availability.
The Companion declares availability from its server-bound typed ports and
runtime schema probes. Notification and fixed vehicle spawning can use a local
typed transport, but callers never supply a command, socket, credential, path,
or raw transport reply. Vehicle spawning creates only the private
#spawnvehicle <vehicleCode> template from the plugin allowlist.
Semantic events come from bounded Run stdout/stderr records. Unknown records create diagnostics and never produce fabricated events. Run database access is limited to typed allowlisted projections and safe mutations; DSNs, rows, SQL, and credentials do not leave Run.