fix: Complete auxiliary texture initialization fix

Root cause: After swapping init/resize order, effects with Renderer3D crashed
because resize() called before init() tried to use uninitialized GPU resources.

Changes:
- Add guards in FlashCubeEffect::resize() and Hybrid3DEffect::resize() to
  check ctx_.device before calling renderer_.resize()
- Remove lazy initialization remnants from CircleMaskEffect and CNNEffect
- Register auxiliary textures directly in init() (width_/height_ already set)
- Remove ensure_texture() methods and texture_initialized_ flags

All 36 tests passing. Demo runs without crashes.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/src/gpu/effects/hybrid_3d_effect.cc b/src/gpu/effects/hybrid_3d_effect.cc
index d580471..61b3734 100644
--- a/src/gpu/effects/hybrid_3d_effect.cc
+++ b/src/gpu/effects/hybrid_3d_effect.cc
@@ -12,8 +12,14 @@ Hybrid3DEffect::Hybrid3DEffect(const GpuContext& ctx) : Effect(ctx) {
 }
 
 void Hybrid3DEffect::resize(int width, int height) {
-  width_ = width;
-  height_ = height;
+  if (width == width_ && height == height_)
+    return;
+
+  Effect::resize(width, height);
+
+  if (!ctx_.device)
+    return;
+
   renderer_.resize(width_, height_);
 }