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-xaudio-resume/extract_window.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+"""Extract canary tid=6 events around the XAudio spawn window (idx 106750-107800)
+and tid=14/15 first events. Looking for the resume mechanism."""
+import json
+import os
+
+PATH = "/home/fabi/RE - Project Sylpheed/xenia-canary/build-cross/bin/Windows/Debug/canary-jitter-1.jsonl"
+
+tid6_events = []  # idx 106700 to 107800
+tid14_first = []
+tid15_first = []
+tid14_count = 0
+tid15_count = 0
+seen_tid6_high = False
+
+with open(PATH, "rb") as f:
+    for line in f:
+        try:
+            obj = json.loads(line)
+        except Exception:
+            continue
+        tid = obj.get("tid")
+        idx = obj.get("tid_event_idx", obj.get("idx"))
+        if tid == 6 and idx is not None and 106700 <= idx <= 108200:
+            tid6_events.append(obj)
+            if idx > 108000:
+                seen_tid6_high = True
+        elif tid == 14 and tid14_count < 120:
+            tid14_first.append(obj)
+            tid14_count += 1
+        elif tid == 15 and tid15_count < 120:
+            tid15_first.append(obj)
+            tid15_count += 1
+        if seen_tid6_high and tid14_count >= 120 and tid15_count >= 120:
+            break
+
+OUT = os.path.dirname(os.path.abspath(__file__))
+with open(os.path.join(OUT, "tid6_window.json"), "w") as f:
+    json.dump(tid6_events, f, indent=2)
+with open(os.path.join(OUT, "tid14_first.json"), "w") as f:
+    json.dump(tid14_first, f, indent=2)
+with open(os.path.join(OUT, "tid15_first.json"), "w") as f:
+    json.dump(tid15_first, f, indent=2)
+
+print(f"tid6 window: {len(tid6_events)}")
+print(f"tid14 first: {len(tid14_first)}")
+print(f"tid15 first: {len(tid15_first)}")