Playertest: scene/script system refactor and Wii ABI fix

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/dusklinux/script/module/moduleplatformlinux.h

@@ -8,6 +8,6 @@
 #pragma once
 #include "script/scriptcontext.h"
 
-void modulePlatformLinux(scriptcontext_t *ctx) {
-  scriptContextExec(ctx, "LINUX = true\n");
+static void modulePlatformLinux(lua_State *L) {
+  luaL_dostring(L, "LINUX = true\n");
 }