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/phase-ab-verify/snap-canary-002/canary/memory.json

@@ -0,0 +1,86 @@
+{
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+  "engine": "canary",
+  "page_size": 4096,
+  "guest_address_space_bytes": 4294967296,
+  "heaps": [
+    {
+      "base": "0x00000000",
+      "name": "v00000000",
+      "page_size": 4096,
+      "page_state_histogram": {
+        "committed": 153,
+        "free": 261991
+      },
+      "size": "0x40000000"
+    },
+    {
+      "base": "0x40000000",
+      "name": "v40000000",
+      "page_size": 65536,
+      "page_state_histogram": {
+        "committed": 30,
+        "free": 16098
+      },
+      "size": "0x3f000000"
+    },
+    {
+      "base": "0x80000000",
+      "name": "v80000000",
+      "page_size": 65536,
+      "page_state_histogram": {
+        "committed": 146,
+        "free": 3950
+      },
+      "size": "0x10000000"
+    },
+    {
+      "base": "0x90000000",
+      "name": "v90000000",
+      "page_size": 4096,
+      "page_state_histogram": {
+        "free": 65536
+      },
+      "size": "0x10000000"
+    }
+  ],
+  "regions": [
+    {
+      "byte_count": 4096,
+      "end": "0x30028000",
+      "protect": 0,
+      "section_kind": null,
+      "sha256": "ad7facb2586fc6e966c004d7d1d16b024f5805ff7cb47c7a85dabd8b48892ca7",
+      "start": "0x30027000"
+    },
+    {
+      "byte_count": 4096,
+      "end": "0x30029000",
+      "protect": 0,
+      "section_kind": null,
+      "sha256": "2390751521f95a4c513da387bc2ee8a82c5b9261bfc565be5e108fafbda61cf3",
+      "start": "0x30028000"
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+      "end": "0x701d0000",
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+    },
+    {
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+      "end": "0x82920000",
+      "protect": 0,
+      "section_kind": null,
+      "sha256": "a70993b77ca9e29218d033fad7c0b45c874676c4e0edd966545d39b266486a9c",
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+    }
+  ],
+  "committed_pages_total": 2466,
+  "section_contents": null,
+  "deterministic_skip": [
+    "host_base_pointer"
+  ]
+}