Freeze Compute Governor v2 and asynchronous Vulkan Matcher execution.
Governor now owns production task admission and live resource adaptation,
with GPU-first AUTO selection for validated backends, CPU12 host capacity,
desktop CPU/RAM reserves, UMA accounting, pressure throttling, hysteresis,
and recovery.
Validate and freeze the rolling Vulkan ORB Matcher path, host topology
policy, task capability envelopes, runtime telemetry, restart/durability
contracts, portable CPU fallback, and scientific equivalence.
COMPUTE_GOVERNOR_V2=PASS/FROZEN
ORB_VULKAN_ASYNC_EXECUTION=PASS/FROZEN
MATCHER_GPU=EXISTING_BACKEND_VALIDATED_AND_PREFERRED
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