fix(windows-drivers): STEP 3 DONE — IddCx adapter inits on-glass (Status=OK)

The all-Rust wdk-sys IddCx driver now initializes its adapter on the RTX box:
IddCxAdapterInitAsync -> 0x0, EvtIddCxAdapterInitFinished fires, device Status=OK.

ROOT CAUSE (found via cdb wt-trace of iddcx!IddCxImplAdapterInitAsync + the upstream
virtual-display-rs source): IDDCX_ENDPOINT_DIAGNOSTIC_INFO.GammaSupport was left zeroed
= IDDCX_FEATURE_IMPLEMENTATION_UNINITIALIZED (0), which the framework adapter validator
(ddivalidation.cpp:797) rejects with STATUS_INVALID_PARAMETER. Must be NONE (1).

Also required (matched to the proven-working upstream virtual-display-rs, installed +
verified Status=OK on the same box):
- caps Flags = NONE (SDR). CAN_PROCESS_FP16 needs a newer contract than UmdfExtensions=
  IddCx0102 grants; deferred to STEP 7 (HDR).
- SDR config: only the 7 required callbacks (+ DeviceIoControl for the proto control
  plane). The *2/gamma/HDR-metadata/query-target-info callbacks are FP16-obligated and
  rejected without FP16 caps; they return in STEP 7.
- device WDF context type on WdfDeviceCreate; adapter WDF context type on the init attrs.

Debugging note: cdb is reliable via live-attach (go-file gate to avoid the
IsDebuggerPresent race) but cdb -z static hangs on the VM; iddcx WPP needs the control
GUID (TMF GUIDs are not it). Diagnostics trimmed; log.rs dbglog kept for STEP 4+.

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

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

@@ -80,12 +80,10 @@ extern "C" fn driver_add(_driver: WDFDRIVER, mut init: PWDFDEVICE_INIT) -> NTSTA
     cfg.EvtIddCxMonitorGetDefaultDescriptionModes = Some(callbacks::monitor_get_default_modes);
     cfg.EvtIddCxMonitorQueryTargetModes = Some(callbacks::monitor_query_modes);
     cfg.EvtIddCxAdapterCommitModes = Some(callbacks::adapter_commit_modes);
-    cfg.EvtIddCxParseMonitorDescription2 = Some(callbacks::parse_monitor_description2);
-    cfg.EvtIddCxMonitorQueryTargetModes2 = Some(callbacks::monitor_query_modes2);
-    cfg.EvtIddCxAdapterCommitModes2 = Some(callbacks::adapter_commit_modes2);
-    cfg.EvtIddCxAdapterQueryTargetInfo = Some(callbacks::query_target_info);
-    cfg.EvtIddCxMonitorSetDefaultHdrMetaData = Some(callbacks::set_default_hdr_metadata);
-    cfg.EvtIddCxMonitorSetGammaRamp = Some(callbacks::set_gamma_ramp);
+    // SDR config — matches the working upstream virtual-display-rs. The *2 / gamma / HDR-metadata /
+    // query-target-info callbacks are FP16-OBLIGATED: registering them while caps declare no FP16 makes the
+    // framework's adapter Validate reject (ddivalidation.cpp:797 -> INVALID_PARAMETER). They return with
+    // FP16 caps under a higher UmdfExtensions binding in STEP 7 (HDR).
     cfg.EvtIddCxMonitorAssignSwapChain = Some(callbacks::assign_swap_chain);
     cfg.EvtIddCxMonitorUnassignSwapChain = Some(callbacks::unassign_swap_chain);
     cfg.EvtIddCxDeviceIoControl = Some(callbacks::device_io_control);