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/iterate-2A-branch-probe/run-commands.txt

@@ -0,0 +1,12 @@
+# Canary
+cd "/home/fabi/RE - Project Sylpheed/xenia-canary/build-cross/bin/Windows/Debug"
+timeout 120 /usr/bin/wine xenia_canary_i2a.exe \
+  "/home/fabi/RE - Project Sylpheed/Project Sylpheed - Arc of Deception (USA, Europe) (En,Ja).iso" \
+  --mute=true \
+  --audit_61_branch_probe_pcs="0x82452E0C,0x821CB1DC,0x82452F10,0x82452F8C,0x82453910,0x824539A4,0x82452DC0"
+
+# Ours
+timeout 120 /home/fabi/RE\ -\ Project\ Sylpheed/xenia-rs/target/release/xrs-i2a exec \
+  "/home/fabi/RE - Project Sylpheed/Project Sylpheed - Arc of Deception (USA, Europe) (En,Ja).iso" \
+  -n 50000000 \
+  --branch-probe="0x82452E0C,0x821CB1DC,0x82452F10,0x82452F8C,0x82453910,0x824539A4,0x82452DC0"