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, 0 insertions, 3 deletions

diff --git a/src/gpu/effects/circle_mask_effect.h b/src/gpu/effects/circle_mask_effect.h
index 91443d8..6ebaca1 100644
--- a/src/gpu/effects/circle_mask_effect.h
+++ b/src/gpu/effects/circle_mask_effect.h
@@ -29,11 +29,8 @@ class CircleMaskEffect : public Effect {
   static_assert(sizeof(CircleMaskParams) == 16,
                 "CircleMaskParams must be 16 bytes for WGSL alignment");
 
-  void ensure_texture();
-
   MainSequence* demo_ = nullptr;
   float radius_;
-  bool texture_initialized_ = false;
 
   WGPURenderPipeline compute_pipeline_ = nullptr;
   WGPUBindGroup compute_bind_group_ = nullptr;