Release v0.7.1 - Desktop Cycle-Accurate Execution Fix Critical fix for desktop application to use cycle-accurate emulation mode, matching the execution behavior of the 100%-passing test suite. - Changed step_frame() → step_frame_accurate() in app.rs - Desktop now uses cycle-perfect execution (1 CPU : 3 PPU : 1 APU) - Mid-frame register updates work correctly - Timing-sensitive effects (sprite 0 hit, scroll splits) render properly - Added Bus::with_sample_rate() constructor - Added Console::with_sample_rate() constructor - APU generates samples at exact audio device rate - Eliminates pitch shifting artifacts - step_frame(): Batches entire instructions, then syncs PPU/APU (coarse) - step_frame_accurate(): Executes 1 cycle at a time (cycle-perfect) - Default sample rate: 48000 Hz (backward compatible)