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-2026-112515/CVE-2026-112515.c

@@ -0,0 +1,35 @@
+// probe.hid · IOKit.framework / GameController.framework · CVE-2026-112515
+// HID event path reachability probe
+// C twin of the Swift POC: dlopens IOKit and GameController, dlsyms the HID entry
+// points the CVE lives behind, and reports which resolve in this process.
+// Build: clang -O2 -o cve-2026-112515 CVE-2026-112515.c
+// Run:   ./cve-2026-112515
+
+#include <stdio.h>
+#include <string.h>
+#include <dlfcn.h>
+
+static void probe(const char *lib, const char **symbols, int n) {
+    void *h = dlopen(lib, RTLD_NOW);
+    if (!h) {
+        printf("x %s\n", lib);
+        return;
+    }
+    printf("ok %s\n", lib);
+    for (int i = 0; i < n; i++) {
+        printf("  %s: %s\n", symbols[i], dlsym(h, symbols[i]) ? "resolved" : "missing");
+    }
+}
+
+int main(void) {
+    const char *iokit_syms[] = {
+        "IOHIDManagerCreate", "IOHIDDeviceGetProperty", "IOHIDEventCreateCopy",
+        "IOHIDEventSystemClientCreate", "IOHIDEventCreateData",
+    };
+    const char *gc_syms[] = {"GCController", "GCHIDEventSource", "GCExtendedGamepad"};
+
+    probe("/System/Library/Frameworks/IOKit.framework/IOKit", iokit_syms, 5);
+    probe("/System/Library/Frameworks/GameController.framework/GameController", gc_syms, 3);
+    printf("CVE-2026-112515 · HID path probed\n");
+    return 0;
+}