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.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 {
 }
 
 
-