chore(windows-drivers): clean up STEP-3 debugging artifacts; restore device interface

Verified on-glass after cleanup: adapter still inits (IddCxAdapterInitAsync 0x0,
Status OK) and WdfDeviceCreateDeviceInterface 0x0.

- RESTORE WdfDeviceCreateDeviceInterface (regression from debugging): the proto control
  plane sends IOCTLs via EvtIddCxDeviceIoControl, which needs the device interface for the
  host to open. Upstream omits it only because it uses a socket; ours is IOCTL-based.
- Drop the framework_struct_size / version-table machinery + size.rs: size_of suffices
  (these are IddCx 1.10 structs on a 1.10 framework, matching upstream). The version-table
  reads were added chasing a size mismatch that was never the bug (GammaSupport was).
- Drop /OPT:NOICF (ICF folding was a non-issue) + fix the stale stub-pick comment (the
  1.10 stub is needed for the dispatch table, not size.rs symbols).
- Debug-wait/PID-file/go-file gate already removed.

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

packaging/windows/drivers/pf-vdisplay/src/lib.rs

@@ -17,7 +17,6 @@ mod callbacks;
 #[allow(dead_code)] // salvaged verbatim; wired into the mode callbacks in STEP 4
 mod edid;
 mod entry;
-mod size;
 
 use wdk_sys::NTSTATUS;