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/manifest.json

@@ -0,0 +1,11 @@
+{
+  "schema_version": 1,
+  "engine": "canary",
+  "files": {
+    "config.json": "fbcaaba400e1fcc39eade7ac54c423ad06bd37cf594c3a3275a64288ff433122",
+    "cpu_state.json": "b57464533ac776df8d9f752678bca1a9ba7df77adc896eb313766952a50326dd",
+    "kernel.json": "78affa1cbb3bc93402a9c0e8686c9a632a5ce0b676999e68aad05e972b0dbc7b",
+    "memory.json": "18e39edfd15ce93042f2fe522254136b55d816df196164d5e2580751d2238e25",
+    "vfs.json": "93a5ee2826dc85d0d2c0559287a096b2d52e1f84fef8921ad024a1ca18c445ff"
+  }
+}