fix(win): update wgpu-native to v27, unify Windows/macOS API paths

- fetch_win_deps.sh: update wgpu-native v0.19.4.1 → v27.0.4.0 (same as macOS)
- platform.h: remove v0.19 compat shims, Windows now uses WGPUStringView API
- gpu.cc/gpu.h: remove DEMO_CROSS_COMPILE_WIN32 old-API branches
- texture_readback.cc, visual_debug.cc, hybrid3d_effect.cc: same cleanup
- rotating_cube_effect.cc: remove #ifdef guard for depthSlice
- glfw3webgpu.c: remove old WGPUSurfaceDescriptorFromWindowsHWND branch
- asset_manager.cc: fix DEMO_STRIP_ALL→STRIP_ALL guard (vs_main was missing
  in STRIP_ALL Windows builds because disk-loading path ran on embedded data)
- tracker.cc: skip MP3 assets gracefully in STRIP_ALL builds instead of fatal

handoff(Gemini): Windows .exe now runs under Wine. demo64k.exe renders frames
and progresses through audio timeline. Pre-existing test failures unchanged.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gpu/pipeline_builder.cc b/src/gpu/pipeline_builder.cc
index ea4a272..2d9ec07 100644
--- a/src/gpu/pipeline_builder.cc
+++ b/src/gpu/pipeline_builder.cc
@@ -54,6 +54,9 @@ RenderPipelineBuilder::depth(WGPUTextureFormat depth_fmt) {
   depth_.format = depth_fmt;
   depth_.depthWriteEnabled = WGPUOptionalBool_True;
   depth_.depthCompare = WGPUCompareFunction_Less;
+  // Vulkan backend panics on WGPUCompareFunction_Undefined (zero) in stencil
+  depth_.stencilFront.compare = WGPUCompareFunction_Always;
+  depth_.stencilBack.compare = WGPUCompareFunction_Always;
   return *this;
 }