handoff: VSync/event-wedge fixes + iterate 2.A–2.BC research notes

Source changes (dormant parity infra, retained from iterate 2.AI/2.AO):
- xenia-kernel/exports.rs: nt_create_event manual_reset polarity +
  related event wiring
- xenia-gpu/mmio_region.rs: D1MODE_VBLANK_VLINE_STATUS hardcode parity

Also lands the audit-runs/ analysis notes (.md/.txt/.json digests) for the
iterate 2.x VSync/0x10e8/0x1004 wedge investigation. Raw trace dumps
(.jsonl/.gz/.csv/.stdout) and agent worktrees (.claude/) are gitignored as
regenerable local artifacts — see memory + HANDOFF for the running findings.

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

audit-runs/review-a-step2-natural-trigger/canary-tid6-install-window.summary

@@ -0,0 +1,43 @@
+Canary tid=6 install-window event summary [host_ns 9000000000..11000000000]
+
+=== Top kernel.call by frequency ===
+    7525  RtlLeaveCriticalSection
+    7523  RtlEnterCriticalSection
+     237  XamInputGetCapabilities
+     178  NtWaitForSingleObjectEx
+     162  NtSetEvent
+      98  XNotifyGetNext
+      80  NtReleaseSemaphore
+      79  XamInputGetKeystrokeEx
+      79  XamInputGetState
+      43  RtlInitializeCriticalSection
+      19  NtAllocateVirtualMemory
+      18  NtCreateEvent
+      16  NtReadFile
+      16  RtlNtStatusToDosError
+      14  MmAllocatePhysicalMemoryEx
+      12  KeRaiseIrqlToDpcLevel
+      12  KeAcquireSpinLockAtRaisedIrql
+      12  KeReleaseSpinLockFromRaisedIrql
+      12  KfLowerIrql
+       5  ExCreateThread
+       4  RtlInitializeCriticalSectionAndSpinCount
+       4  ObReferenceObjectByHandle
+       4  KeSetAffinityThread
+       4  ObDereferenceObject
+       3  NtClose
+       2  RtlInitAnsiString
+       2  NtCreateFile
+       2  NtQueryInformationFile
+       2  KeQueryPerformanceFrequency
+       1  NtResumeThread
+       1  NtCreateSemaphore
+       1  XamGetSystemVersion
+       1  XMsgInProcessCall
+       1  XMsgStartIORequestEx
+       1  XamResetInactivity
+       1  XamEnableInactivityProcessing
+       1  XGetVideoMode
+
+=== Unique kernel.call names ===
+  37