feat(host/windows): resident virtual HID mouse (pf-mouse UMDF minidriver)

Headless Windows hosts (no dongle) stream an INVISIBLE cursor: with no
pointing device present win32k reports SM_MOUSEPRESENT=0 and DWM never
composites a pointer into the pf-vdisplay frame, even though SendInput
moves it. Keep ONE virtual HID mouse devnode alive for the host's
lifetime — the Sunshine/Parsec-class fix, zero client changes.

- pf-mouse: UMDF2 HID minidriver, one fixed identity (PF:MO 5046:4D4F,
  obviously virtual, nothing fingerprints it), one 8-byte input report
  (5 buttons + absolute 15-bit X/Y + wheel + AC-pan). Transport is the
  sealed pad channel verbatim (Global\pfmouse-boot-0 mailbox + unnamed
  MouseShm DATA section) so pf-umdf-util's audited layer serves it
  unchanged; report delivery is event-driven (idle = no HID traffic).
- host: inject::mouse_windows — VirtualMouse (SwDeviceCreate'd devnode +
  channel), ensure_resident() keeper thread started by every
  InjectorService (process-wide, PUNKTFUNK_NO_VIRTUAL_MOUSE opts out),
  vmouse-spike on-glass validation (cursor sweep via HID reports).
- proto: mouse module (magic, boot-name, identity, report layout,
  unit-tested input_report packing).
- SwDeviceProfile grows container_tag so the mouse's ContainerId family
  (PFMO) never groups with a pad's (PFDS) in the Devices UI.
- packaging: pf-mouse rides the gamepad-driver build + install pipeline
  (build-gamepad-drivers.ps1, windows-drivers.yml, driver install
  --gamepad picks up every staged .inf).

On-glass validated on winbox: devnode + HID child bind, SM_MOUSEPRESENT=1
with no physical mouse, cursor sweeps via HID reports (vmouse-spike).

This work was implemented in a parallel session; committed here as the
build prerequisite for the HID compose kick that follows.

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

packaging/windows/drivers/pf-mouse/Cargo.toml

@@ -0,0 +1,32 @@
+# pf-mouse - punktfunk virtual HID mouse (absolute pointer) UMDF2 HID minidriver.
+# A member of the in-tree drivers workspace (shares the vendored wdk-sys/wdk-build with the bindgen pin
+# + the crt-static .cargo/config), built from source per release like the gamepad drivers.
+[package]
+name = "pf-mouse"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+publish = false
+description = "punktfunk virtual HID mouse (absolute pointer) UMDF2 HID minidriver"
+
+[package.metadata.wdk.driver-model]
+driver-type = "UMDF"
+umdf-version-major = 2
+target-umdf-version-minor = 31
+
+[lib]
+crate-type = ["cdylib"]
+
+[build-dependencies]
+wdk-build.workspace = true
+
+[dependencies]
+wdk.workspace = true
+wdk-sys.workspace = true
+pf-driver-proto.workspace = true
+pf-umdf-util.workspace = true
+
+[features]
+default = ["hid"]
+hid = ["wdk-sys/hid"]
+nightly = ["wdk-sys/nightly", "wdk/nightly"]