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-c-first-divergence/snap-001/canary/manifest.json

@@ -0,0 +1,11 @@
+{
+  "schema_version": 1,
+  "engine": "canary",
+  "files": {
+    "config.json": "6f1369b1743ba754bdff1c06d62c762e3e6108d6ed0d877f2151cb606e94f40d",
+    "cpu_state.json": "b57464533ac776df8d9f752678bca1a9ba7df77adc896eb313766952a50326dd",
+    "kernel.json": "78affa1cbb3bc93402a9c0e8686c9a632a5ce0b676999e68aad05e972b0dbc7b",
+    "memory.json": "50f4dae2642a71d83b7c58e0fa26d1164f7a4df2327ba6e589f6fd42d521d161",
+    "vfs.json": "93a5ee2826dc85d0d2c0559287a096b2d52e1f84fef8921ad024a1ca18c445ff"
+  }
+}