feat(kotlin-compose): design system + 33 components + gallery_kt + e2e android emulator + scaffolder fixes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cpp/functions/gfx/sokol_setup.md

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+---
+name: sokol_setup
+kind: function
+lang: cpp
+domain: gfx
+version: "0.1.0"
+purity: pure
+signature: "make_environment() -> sg_environment; make_swapchain(int w, int h) -> sg_swapchain"
+description: "Builders puros para inicializar sokol_gfx encima de un GL context creado por SDL3 (no por sokol_app). Construye sg_environment con defaults RGBA8 + depth/stencil y sg_swapchain con el default framebuffer del contexto activo. Issue 0072b — base del runtime gamedev en PC + WASM."
+tags: [gamedev, sokol, gfx, sdl3, wasm]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: ""
+imports: []
+example: |
+  // tras SDL_GL_CreateContext():
+  sg_desc d{};
+  d.environment = fn::gfx::make_environment();
+  d.logger.func = slog_func;
+  sg_setup(&d);
+  // por frame:
+  sg_pass p{};
+  p.swapchain = fn::gfx::make_swapchain(w, h);
+  sg_begin_pass(&p);
+tested: false
+tests: []
+test_file_path: ""
+file_path: "cpp/functions/gfx/sokol_setup.cpp"
+params:
+  - name: width
+    desc: "Ancho del framebuffer en pixeles. Usar SDL_GetWindowSizeInPixels."
+  - name: height
+    desc: "Alto del framebuffer en pixeles."
+output: "Estructuras sg_environment / sg_swapchain listas para sokol_gfx."
+---
+
+# sokol_setup
+
+Helpers minimos para usar `sokol_gfx` con SDL3 sin depender de `sokol_glue.h` (que importa simbolos de `sokol_app` y rompe en stacks SDL3-driven).
+
+Definidos como funciones puras: solo construyen structs, no tocan estado global. Llamadas tipicas en `engine_smoke` (issue 0072a) y `runtime_test` (0072b).