Stage-1 CI for the Windows-host rewrite: a probe job on the self-hosted
windows-amd64 runner that reports the driver toolchain (WDK Include km/ +
iddcx versions, inf2cat/stampinf/devgen/signtool, EWDK, LLVM/clang version,
cargo-make, installed Rust targets) so we know what's provisioned BEFORE
writing driver code, and builds+tests+lints pf-vdisplay-proto on MSVC to prove
the owned ABI crate compiles cross-OS and the CI wiring works. No RTX GPU needed
for any of this (only live NVENC encode needs one — that defers to the RTX box).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
