layout: restructure into src/ tests/ android/ scripts/ tools/

- extension/src/{port,platform,codepage} -> src/; native_render -> src/host
  (+ dxt, shaders/); libgr2 -> src/gr2; extension/third_party -> third_party
- extension/tests -> tests/port, libgr2/tests -> tests/gr2
- android-native -> android (build.sh, push-client.sh moved in)
- script -> scripts; tools/40250 -> tools/server; oracle -> tools/granny-oracle;
  perf tools -> tools/perf
- all build trees under build/ (native, release, android, port-gate)
- xrender:: CMake aliases -> mt::; port-map ledger impl paths rewritten

No code changes. ctest 15/15, port_gate macos+android PASS, port_map check 0 errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/platform/EterLib/GrpDetector.cpp

@@ -0,0 +1,165 @@
+// Platform skeleton for EterLib/GrpDetector.h (40250 EterLib/GrpDetector.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/GrpDetector.h"
+
+#include "../PlatformStub.h"
+
+auto D3D_SModeInfo::GetString(std::string *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto D3D_CAdapterDisplayModeList::Build(IDirect3D8 &, D3DFORMAT, UINT) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto D3D_CAdapterDisplayModeList::GetDisplayModeNum() -> UINT
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<UINT>();
+}
+
+auto D3D_CAdapterDisplayModeList::GetPixelFormatNum() -> UINT
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<UINT>();
+}
+
+auto D3D_CAdapterDisplayModeList::GetDisplayModer(UINT) -> const D3DDISPLAYMODE &
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<const D3DDISPLAYMODE &>();
+}
+
+auto D3D_CAdapterDisplayModeList::GetPixelFormatr(UINT) -> const D3DFORMAT &
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<const D3DFORMAT &>();
+}
+
+auto D3D_CDeviceInfo::Build(IDirect3D8 &, UINT, UINT, D3D_CAdapterDisplayModeList &, PFNCONFIRMDEVICE) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+auto D3D_CDeviceInfo::Find(UINT, UINT, UINT, BOOL, UINT *) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+auto D3D_CDeviceInfo::GetD3DModeInfoNum() -> UINT
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<UINT>();
+}
+
+auto D3D_CDeviceInfo::GetString(std::string *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto D3D_CDeviceInfo::FindDepthStencilFormat(IDirect3D8 &, UINT, D3DDEVTYPE, D3DFORMAT, D3DFORMAT *) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+auto D3D_CDeviceInfo::GetD3DModeInfor(UINT) -> D3D_SModeInfo &
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<D3D_SModeInfo &>();
+}
+
+auto D3D_CDeviceInfo::GetD3DModeInfop(UINT) -> D3D_SModeInfo *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<D3D_SModeInfo *>();
+}
+
+decltype(D3D_CDeviceInfo::msc_aszD3DDevDesc) D3D_CDeviceInfo::msc_aszD3DDevDesc{};
+
+decltype(D3D_CDeviceInfo::msc_aeD3DDevType) D3D_CDeviceInfo::msc_aeD3DDevType{};
+
+auto D3D_CAdapterInfo::Find(UINT, UINT, UINT, BOOL, UINT *, UINT *) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+auto D3D_CAdapterInfo::Build(IDirect3D8 &, UINT, PFNCONFIRMDEVICE) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+auto D3D_CAdapterInfo::GetString(std::string *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto D3D_CAdapterInfo::GetDesktopD3DDisplayModer() -> D3DDISPLAYMODE &
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<D3DDISPLAYMODE &>();
+}
+
+auto D3D_CAdapterInfo::GetDesktopD3DDisplayModep() -> D3DDISPLAYMODE *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<D3DDISPLAYMODE *>();
+}
+
+auto D3D_CAdapterInfo::GetD3DDeviceInfop(UINT) -> D3D_CDeviceInfo *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<D3D_CDeviceInfo *>();
+}
+
+auto D3D_CAdapterInfo::GetD3DModeInfop(UINT, UINT) -> D3D_SModeInfo *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<D3D_SModeInfo *>();
+}
+
+D3D_CDisplayModeAutoDetector::D3D_CDisplayModeAutoDetector()
+{
+	MT_PLATFORM_STUB();
+}
+
+D3D_CDisplayModeAutoDetector::~D3D_CDisplayModeAutoDetector()
+{
+	MT_PLATFORM_STUB();
+}
+
+auto D3D_CDisplayModeAutoDetector::Find(UINT, UINT, UINT, BOOL, UINT *, UINT *, UINT *) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+auto D3D_CDisplayModeAutoDetector::Build(IDirect3D8 &, PFNCONFIRMDEVICE) -> BOOL
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<BOOL>();
+}
+
+auto D3D_CDisplayModeAutoDetector::GetD3DAdapterInfop(UINT) -> D3D_CAdapterInfo *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<D3D_CAdapterInfo *>();
+}
+
+auto D3D_CDisplayModeAutoDetector::GetD3DModeInfop(UINT, UINT, UINT) -> D3D_SModeInfo *
+{
+	MT_PLATFORM_STUB();
+	return mt_platform_stub_return<D3D_SModeInfo *>();
+}
+
+auto D3D_CDisplayModeAutoDetector::GetString(std::string *) -> void
+{
+	MT_PLATFORM_STUB();
+}