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/EterLib/GrpImageInstance.cpp

@@ -0,0 +1,144 @@
+// Platform skeleton for EterLib/GrpImageInstance.h (40250 EterLib/GrpImageInstance.cpp), generated by platform_stub.py.
+// Every MT_PLATFORM_STUB() body is unimplemented: replace it with the platform implementation.
+#include "EterLib/StdAfx.h"
+#include "EterLib/GrpImageInstance.h"
+
+#include "../PlatformStub.h"
+
+auto CGraphicImageInstance::Type() -> DWORD
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<DWORD>();
+}
+
+auto CGraphicImageInstance::IsType(DWORD) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+CGraphicImageInstance::CGraphicImageInstance()
+{
+	MT_PLATFORM_STUB();
+}
+
+CGraphicImageInstance::~CGraphicImageInstance()
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::Destroy() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::Render() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::SetDiffuseColor(float, float, float, float) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::SetPosition(float, float) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::SetImagePointer(CGraphicImage *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::ReloadImagePointer(CGraphicImage *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::IsEmpty() const -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CGraphicImageInstance::GetWidth() -> int
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<int>();
+}
+
+auto CGraphicImageInstance::GetHeight() -> int
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<int>();
+}
+
+auto CGraphicImageInstance::GetTexturePointer() -> CGraphicTexture *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<CGraphicTexture *>();
+}
+
+auto CGraphicImageInstance::GetTextureReference() const -> const CGraphicTexture &
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<const CGraphicTexture &>();
+}
+
+auto CGraphicImageInstance::GetGraphicImagePointer() -> CGraphicImage *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<CGraphicImage *>();
+}
+
+auto CGraphicImageInstance::operator==(const CGraphicImageInstance &) const -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CGraphicImageInstance::Initialize() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::OnRender() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::OnSetImagePointer() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::OnIsType(DWORD) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+auto CGraphicImageInstance::CreateSystem(UINT) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::DestroySystem() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGraphicImageInstance::New() -> CGraphicImageInstance *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<CGraphicImageInstance *>();
+}
+
+auto CGraphicImageInstance::Delete(CGraphicImageInstance *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+decltype(CGraphicImageInstance::ms_kPool) CGraphicImageInstance::ms_kPool{};