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/first-diff-report.md

@@ -0,0 +1,45 @@
+# Phase C — first byte-diff report
+
+- canary image.bin: snap-001/canary/image.bin (9568256 bytes)
+- ours   image.bin: snap-001/ours/image.bin (9568256 bytes)
+- pe     reference: /home/fabi/RE - Project Sylpheed/Project Sylpheed - Arc of Deception (USA, Europe) (En,Ja).pe (9568256 bytes)
+- image_base: 0x82000000
+- import-slot ranges (merged): 3, bytes=3920
+
+## Raw byte hashes
+- canary sha256: `a70993b77ca9e29218d033fad7c0b45c874676c4e0edd966545d39b266486a9c`
+- ours   sha256: `ea8d160e9369328a5b922258a92113efb8d7ce3e1a5c12cc521e375985c91c18`
+- pe     sha256: `9be5f5621c517c78a451245eca25d54388af741ed20e669b2f78438aaa429e72`
+
+## Pass 1 — raw byte-diff (uncanonicalized)
+
+- first byte-diff at off=0x00000600 VA=0x82000600
+- classification: .rdata (off=+0x0 into section)
+- canary byte: 0xde
+- ours   byte: 0x00
+- pe ref byte: 0x00
+
+context canary: `00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 de ad c0 de de ad c0 de de ad c0 de de ad c0 de de`
+context ours  : `00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00`
+context pe    : `00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 8c 00 00 02 bc 00 00 02 c1 00 00 02 d5 00`
+
+## Pass 2 — canonicalized (import slots masked to 0xCD)
+
+- canary canonical sha256: `62c51908e2df705583fe81a084f39bd399196f9000cfa7bffd56127b41a4ab96`
+- ours   canonical sha256: `62c51908e2df705583fe81a084f39bd399196f9000cfa7bffd56127b41a4ab96`
+- pe     canonical sha256: `62c51908e2df705583fe81a084f39bd399196f9000cfa7bffd56127b41a4ab96`
+
+- **canary == ours canonical match ✅**
+- the image_loaded_sha256 mismatch is **fully explained** by legitimate engine-specific import-thunk patches.
+- NO real engine divergence at this layer.
+
+## Pass 3 — engine vs .pe ground truth (canonicalized)
+
+- canary canonical == pe canonical ✅
+- ours canonical == pe canonical ✅
+
+## Summary
+
+- bytes differing raw: 3704
+- bytes differing canonical: 0
+- import-slot mask bytes: 3920