feat: Add --seek command line option for fast-forward debugging

This feature allows developers to jump to a specific time in the demo sequence (e.g., './demo64k --seek 10.5'). It simulates the game logic, audio state (rendering silent buffers), and visual physics (compute shaders) from t=0 up to the target time before starting real-time playback. Audio initialization is refactored to separate device init and start.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gpu/gpu.h b/src/gpu/gpu.h
index f9c322c..1d79781 100644
--- a/src/gpu/gpu.h
+++ b/src/gpu/gpu.h
@@ -33,6 +33,7 @@ struct RenderPass {
 
 void gpu_init(GLFWwindow *window);
 void gpu_draw(float audio_peak, float aspect_ratio, float time, float beat);
+void gpu_simulate_until(float time);
 void gpu_shutdown();
 
 // Helper functions (exposed for internal/future use)