port 2A step 4: platform skeleton + rest of the 2V3 header closure

- Mirror the remaining non-Python 2V3 closure headers (98 more, 173 total): EffectLib,
  EterGrnLib, SpeedTreeLib, SphereLib, PRTerrainLib, EterImageLib, EterBase/Poly, cipher/tea,
  EterLib Grp*/IME/Input/MSWindow/StateManager, GameLib actor/map/race headers, EterPack.
- SDK shims: granny.h, SpeedTreeRT.h, imm.h, Dimm.h (the SDK MIDL header, not mirrored),
  dinput/d3dx8 additions; D3D8 render-state enums, FVF macros and the COM resource hierarchy;
  more Win32 GDI/handle types with layout static_asserts.
- PORT edits for MSVC-permissive code (typename, friend visibility, <algorithm>, pointer→uintptr_t)
  and PRTerrainLib/StdAfx.h dropping the ScriptLib/Python include.
- port_logic links the vendored cryptopp/minilzo.
- extension/src/platform: port_platform target with 103 generated stub files (1917 function
  stubs, 146 static members) from the new platform_stub.py (clang -ast-dump-filter);
  MT_PLATFORM_STUB() marks every unimplemented body. libmtgodot links port_platform and
  port_gate.sh builds it.

Gate: macOS, Android, iOS, Windows (mingw) PASS; Linux BLOCKED (no toolchain).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.agents/skills/metin2-40250-parity-audit/SKILL.md

@@ -151,6 +151,10 @@ behavior verified from code inspection alone.
 - `scripts/port_copy.py copy <Lib/File>... | diff [<Lib/File>...]` — copy 40250 files into the
   `extension/src/port/` mirror with mechanical edits only (CP949→UTF-8, LF, include-path case); `diff`
   lists the manual `// PORT:` edits.
+- `scripts/platform_stub.py list | gen [<Lib/File.h>...] [--force]` — generate the empty platform
+  skeleton `extension/src/platform/<Lib>/<File>.cpp` for platform-layer mirror headers from clang's AST
+  (needs `script/port_gate.sh macos` for compile commands); never overwrites without `--force`.
+  `grep -r MT_PLATFORM_STUB extension/src/platform` lists the platform functions still unimplemented.
 - `scripts/port_deps.py closure <file> | slices [--write] | order [--write]` — `#include` graph with the
   implicit edges each library's `StdAfx.h` supplies; writes the 2V0-2V3 unit lists and the batch-2
   topological order to `audit/slices/`. Regenerate after changing a slice definition.