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/EterGrnLib/Mesh.cpp

@@ -0,0 +1,133 @@
+// Platform skeleton for EterGrnLib/Mesh.h (40250 EterGrnLib/Mesh.cpp), generated by platform_stub.py.
+// Every MT_PLATFORM_STUB() body is unimplemented: replace it with the platform implementation.
+#include "EterGrnLib/StdAfx.h"
+#include "EterGrnLib/Mesh.h"
+
+#include "../PlatformStub.h"
+
+CGrannyMesh::CGrannyMesh()
+{
+	MT_PLATFORM_STUB();
+}
+
+CGrannyMesh::~CGrannyMesh()
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::IsEmpty() const -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CGrannyMesh::CreateFromGrannyMeshPointer(granny_skeleton *, granny_mesh *, int, int, CGrannyMaterialPalette &) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CGrannyMesh::LoadIndices(void *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::LoadPNTVertices(void *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::NEW_LoadVertices(void *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::Destroy() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::SetPNT2Mesh() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::DeformPNTVertices(void *, D3DXMATRIX *, granny_mesh_binding *) const -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::CanDeformPNTVertices() const -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CGrannyMesh::IsTwoSide() const -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CGrannyMesh::GetVertexCount() const -> int
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<int>();
+}
+
+auto CGrannyMesh::GetDefaultBoneIndices() const -> int *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<int *>();
+}
+
+auto CGrannyMesh::GetVertexBasePosition() const -> int
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<int>();
+}
+
+auto CGrannyMesh::GetIndexBasePosition() const -> int
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<int>();
+}
+
+auto CGrannyMesh::GetGrannyMeshPointer() const -> const granny_mesh *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<const granny_mesh *>();
+}
+
+auto CGrannyMesh::GetTriGroupNodeList(CGrannyMaterial::EType) const -> const CGrannyMesh::TTriGroupNode *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<const CGrannyMesh::TTriGroupNode *>();
+}
+
+auto CGrannyMesh::RebuildTriGroupNodeList() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::ReloadMaterials() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::Initialize() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CGrannyMesh::LoadMaterials(CGrannyMaterialPalette &) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}
+
+auto CGrannyMesh::LoadTriGroupNodeList(CGrannyMaterialPalette &) -> bool
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<bool>();
+}