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-2026-112638/CVE-2026-112638.c

@@ -0,0 +1,43 @@
+// aud.lc3 · AudioToolbox · LC3 codec gate · CVE-2026-112638
+// LC3 codec AudioConverterNew reachability probe
+// C twin of the Swift POC: drives AudioConverterNew with the LC3 format id at two
+// rate/channel shapes. The entitlement check is an app-side observation; a standalone
+// binary carries no entitlements, so only the codec gate itself is probed here.
+// Build: clang -O2 -o cve-2026-112638 CVE-2026-112638.c -framework AudioToolbox -framework CoreFoundation
+// Run:   ./cve-2026-112638
+
+#include <stdio.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) {
+    audio_converter(0x6C633320, 48000, 1);   // 'lc3 ' 48 kHz mono
+    audio_converter(0x6C633320, 16000, 2);   // 'lc3 ' 16 kHz stereo
+    printf("CVE-2026-112638 · LC3 codec gate probed\n");
+    return 0;
+}