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>

extension/src/platform/PRTerrainLib/Terrain.cpp

@@ -0,0 +1,80 @@
+// Platform skeleton for PRTerrainLib/Terrain.h (40250 PRTerrainLib/Terrain.cpp), generated by platform_stub.py.
+// Every MT_PLATFORM_STUB() body is unimplemented: replace it with the platform implementation.
+#include "PRTerrainLib/StdAfx.h"
+#include "PRTerrainLib/Terrain.h"
+
+#include "../PlatformStub.h"
+
+auto CTerrainImpl::SetTextureSet(CTextureSet *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTerrainImpl::GetTextureSet() -> CTextureSet *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<CTextureSet *>();
+}
+
+decltype(CTerrainImpl::ms_pTextureSet) CTerrainImpl::ms_pTextureSet{};
+
+CTerrainImpl::CTerrainImpl()
+{
+	MT_PLATFORM_STUB();
+}
+
+CTerrainImpl::~CTerrainImpl()
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTerrainImpl::LoadWaterMap(const char *) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTerrainImpl::LoadWaterMapFile(const char *) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTerrainImpl::GetShadowMapColor(float, float) -> DWORD
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<DWORD>();
+}
+
+auto CTerrainImpl::Initialize() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTerrainImpl::Clear() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTerrainImpl::LoadTextures() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTerrainImpl::LoadHeightMap(const char *) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTerrainImpl::RAW_LoadTileMap(const char *) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTerrainImpl::LoadAttrMap(const char *) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}

extension/src/platform/PRTerrainLib/TextureSet.cpp

@@ -0,0 +1,83 @@
+// Platform skeleton for PRTerrainLib/TextureSet.h (40250 PRTerrainLib/TextureSet.cpp), generated by platform_stub.py.
+// Every MT_PLATFORM_STUB() body is unimplemented: replace it with the platform implementation.
+#include "PRTerrainLib/StdAfx.h"
+#include "PRTerrainLib/TextureSet.h"
+
+#include "../PlatformStub.h"
+
+CTextureSet::CTextureSet()
+{
+	MT_PLATFORM_STUB();
+}
+
+CTextureSet::~CTextureSet()
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTextureSet::Initialize() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTextureSet::Clear() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTextureSet::Create() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTextureSet::Load(const char *, float) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTextureSet::Save(const char *) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTextureSet::GetTextureCount() -> unsigned long
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<unsigned long>();
+}
+
+auto CTextureSet::GetTexture(unsigned long) -> TTerrainTexture &
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<TTerrainTexture &>();
+}
+
+auto CTextureSet::RemoveTexture(unsigned long) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTextureSet::SetTexture(unsigned long, const char *, float, float, float, float, bool, unsigned short, unsigned short, float) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTextureSet::Reload(float) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CTextureSet::AddTexture(const char *, float, float, float, float, bool, unsigned short, unsigned short, float) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CTextureSet::AddEmptyTexture() -> void
+{
+	MT_PLATFORM_STUB();
+}