### What v0.2 had

- `SPEC.md` defined byte-precise wire formats for image (8×8 DCT-II +
  YCbCr + JPEG-Q + zigzag + DC-Δ + rANS), audio (orthonormal MDCT +
  sine window + TDAC), video (I/P inter-frame with integer-pel motion).
- Python (`wai/`) + Rust (`wai-rs/`) implementations, byte-equivalent on
  the lossless paths (rANS, container) and reconstruction-equivalent on
  the lossy paths.
- Honest measured standing: image at JPEG-1992 parity (~5% behind
  libjpeg), audio uniform-MDCT (not perceptually competitive with MP3),
  video I/P at ~41% smaller than MJPEG floor but far behind H.264.

