Add 14ch EPOC X Core ML profile (fp16) + parity artifacts

Add 14ch EPOC X Core ML profile (fp16) + parity artifacts

Remove pickle-based artifacts (.pt)

Use normalized rel_l2 threshold parity chart

Improve waveform parity figure readability

Add waveform overlay residual figure and paper-context README updates

Refresh model card with parity graphics and model details

Publish enumerated CoreML profiles (16/32/64 + 64 FP32 fallback)