Windows GPU UNLOCK v0.3.1 — variable headless display children

Fixes headless preflight rejection when firmware exposes more than two RTX display children. The updated wrapper discovered and validated the local display graph, completed automatic unlock, and handed off to Windows on the documented ASUS RTX 3090 system. This release is source-only; local EFI binaries and firmware are not included. The updated boot path was hardware-verified, but no new performance benchmark was run for this release.