feat(tools): display-disturb — deterministic display-stack disturbance generator

The stall-immunity bench needs both stall classes on demand, without a standby
TV or a monitor-tool storm: `ddc` replays the Twinkle-Tray/PowerDisplay-class
DDC/CI traffic (VCP reads, optional capabilities-string requests) through the
win32k I2C path; `modeset` re-commits the current mode with CDS_RESET — the
Level-Two modeset entry that idles the whole adapter with nothing Win32-visible
changing. Every op prints an epoch-stamped took_ms line so host.log stall
reports correlate line-for-line, and the op duration itself measures the
driver's service time per disturbance.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tools/display-disturb/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "display-disturb"
+description = "Deterministic display-stack disturbance generator (vdisplay stall-immunity bench)"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+authors.workspace = true
+repository.workspace = true
+
+[target.'cfg(target_os = "windows")'.dependencies]
+windows = { version = "0.62", features = [
+    "Win32_Devices_Display",
+    "Win32_Graphics_Gdi",
+    "Win32_Foundation",
+] }