Hugging Pair — Neural Harmonica

INSTRUCTION:
Generate neural harmonica phase-coherent audiovisual entrainment output for binaural set {LEFT_FREQ, RIGHT_FREQ} with spatial motion activation enabled.

RESPONSE:
1) Produce cosine-phase-aligned stereo binaural audio.
2) Select FPS as harmonic multiple of BEAT_FREQ (FPS = BEAT_FREQ × N).
3) Generate a phase-locked sinusoidal luminance envelope (cosine phase start).
4) Apply mandatory spatial motion activation cycle (down → right → up → left) synchronized to beat boundaries.
5) Render deterministic visual frames (t = frame_index / FPS).
6) Mux synchronized audio + video into a single deliverable.
7) Add calibration header: visual frame-0 marker + audio impulse tick at t = 0 for device-latency measurement and compensation.