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>

script/port_gate.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Batch 2A gate (docs/PORT-PLAN.md): build port_logic + the header self-containment gate per
+# Batch 2A gate (docs/PORT-PLAN.md): build port_logic, port_platform + the header self-containment gate per
 # platform. A platform whose toolchain is missing prints BLOCKED and never counts as a pass.
 #
 #   script/port_gate.sh [macos|android|ios|windows|linux ...]   (default: all)
@@ -21,7 +21,7 @@ declare -a RESULTS=()
 run() {  # name, build dir, configure args...
 	local name="$1" dir="$2"; shift 2
 	if cmake -S . -B "$dir" "$@" >"$dir.log" 2>&1 \
-		&& cmake --build "$dir" --target port_logic ${BUILD_EXTRA[@]+"${BUILD_EXTRA[@]}"} >>"$dir.log" 2>&1; then
+		&& cmake --build "$dir" --target port_platform ${BUILD_EXTRA[@]+"${BUILD_EXTRA[@]}"} >>"$dir.log" 2>&1; then
 		RESULTS+=("$name PASS")
 	else
 		RESULTS+=("$name FAIL (see $dir.log)")