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.

.gitignore

@@ -10,5 +10,25 @@ deep_nest.usda
 ktx2_bad_dims.ktx2
 stack_bomb.cff
 
+# C POC twin default outputs (written to CWD when run without arguments)
+avc_900_slices.h264
+bc7_short.dds
+cinder27_traversal_probe.txt
+cmap_probe.pdf
+crash_shading_r136.pdf
+decmpfs_probe.bin
+direntry_wrap.tif
+gdef_caret_chase.ttf
+gps_oob.jpg
+gpt_overlong_name.img
+hevc_bad_layer.hevc
+joliet_oob.iso
+marker_length.jpg
+planar_scatter.tif
+rpu_probe_1x6.bin
+traversal.zip
+trunc_strip.tif
+usercomment_oob.jpg
+
 # macOS
 .DS_Store