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>

tests/port/port_python_ui_modules_test.cpp

@@ -0,0 +1,47 @@
+#include "EterPythonLib/StdAfx.h"
+#include "EterPythonLib/PythonWindowManager.h"
+#include "ScriptLib/PythonLauncher.h"
+#include "UserInterface/StdAfx.h"
+extern void initapp();
+#include "../../src/platform/ScriptLib/PythonHost.h"
+
+#include <cstdio>
+#include <string>
+
+int main(int argc, char** argv)
+{
+	const std::string stdlib = argc > 1 ? argv[1] : PythonHost::DefaultStdLibPath();
+	PythonHost::Configure();
+	CPythonLauncher launcher;
+	if (!launcher.Create())
+		return 1;
+	std::string error;
+	if (!PythonHost::InstallStdLib(stdlib.c_str(), &error))
+	{
+		std::fprintf(stderr, "InstallStdLib: %s\n", error.c_str());
+		return 1;
+	}
+	{
+		UI::CWindowManager manager;
+		initgrp();
+		initgrpImage();
+		initgrpText();
+		initgrpThing();
+		initwndMgr();
+		initapp();
+		if (!launcher.RunLine("import wndMgr, grp, grpImage, grpText, grpThing, app"))
+			return 1;
+		if (!launcher.RunLine(
+			"class Handler: pass\n"
+			"window = wndMgr.Register(Handler(), 'UI')\n"
+			"assert window > 0\n"
+			"wndMgr.SetName(window, 'roundtrip')\n"
+			"wndMgr.SetWindowSize(window, 100, 50)\n"
+			"assert wndMgr.GetWindowWidth(window) == 100\n"
+			"wndMgr.Destroy(window)\n"))
+			return 1;
+		manager.Update();
+	}
+	launcher.Clear();
+	return 0;
+}