v0.2.0

What's New

• Media controls — play, pause, next, previous, skip_forward, skip_backward, volume_up, volume_down
• Now-playing state — atv state shows current track title, artist, app, and playback progress
• Playback queue — atv queue lists queued tracks
• Artwork support — atv artwork saves current track artwork to file
• Interactive remote — atv remote for continuous command input
• Raw message streaming — atv messages streams all MRP messages in real time

Improvements

• Complete AirPlay 2 connection with DataStream framing and MRP encryption
• HAP authentication (SRP pair-setup, X25519 pair-verify, Ed25519 signatures)
• ChaCha20-Poly1305 encrypted sessions with HKDF-SHA512 derived keys
• Added MIT license
• Improved README with full API documentation and install instructions