feat(windows-drivers): driver workspace + wdk-probe on windows-drivers-rs (M1)

Stand up packaging/windows/drivers/ — the unified driver workspace on crates.io
windows-drivers-rs (wdk 0.4.1 / wdk-sys + wdk-build 0.5.1), retiring the dev-box
../../crates/wdk* path-deps. First member: wdk-probe, the smallest UMDF2 driver
(DriverEntry -> WdfDriverCreate -> EvtDeviceAdd -> WdfDeviceCreate) that
force-links the shared pf-vdisplay-proto ABI crate. It validates on the runner:
wdk-sys bindgen + WDF stub link against the WDK + LLVM, the cross-workspace
no_std proto path-dep, and the produced DLL's PE FORCE_INTEGRITY bit.

windows-drivers.yml gains a driver-build job: cargo build -p wdk-probe (pinning
Version_Number=10.0.26100.0) + a PE inspection that prints whether /INTEGRITYCHECK
is set — the M0 self-signed-load question.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packaging/windows/drivers/Cargo.toml

@@ -0,0 +1,33 @@
+# Unified in-tree workspace for punktfunk's all-Rust UMDF drivers, on microsoft/windows-drivers-rs
+# (crates.io wdk/wdk-sys/wdk-build — NOT the dev-box ../../crates/wdk* path-deps). Part of the
+# Windows-host rewrite (docs/windows-host-rewrite.md, M1). pf-vdisplay + the gamepad drivers move here.
+#
+# Separate from the main cargo workspace (own [workspace] root) because driver crates are cdylibs built
+# with the WDK toolchain (cargo-wdk / wdk-build) on Windows only. Path-deps the shared ABI crate
+# crates/pf-vdisplay-proto from the main tree.
+[workspace]
+resolver = "2"
+members = ["wdk-probe"]
+
+[workspace.package]
+edition = "2024"
+version = "0.0.1"
+license = "MIT OR Apache-2.0"
+publish = false
+
+[workspace.dependencies]
+wdk = "0.4.1"
+wdk-sys = "0.5.1"
+wdk-build = "0.5.1"
+pf-vdisplay-proto = { path = "../../../crates/pf-vdisplay-proto" }
+
+# windows-drivers-rs marks a driver workspace with this section (per-package driver-model overrides it).
+[workspace.metadata.wdk]
+
+[profile.dev]
+panic = "abort"
+lto = true
+
+[profile.release]
+panic = "abort"
+lto = true