v0.13.0

Added

• MCP (Model Context Protocol) server: A new kind: mcp controller exposes mtrack to
  MCP-compatible clients such as Claude Desktop and Claude Code over a Streamable HTTP
  transport mounted at /mcp (default port 43237, localhost-only). It offers ~45 tools
  spanning playback control (play, stop, next/previous, play-from, section looping),
  configuration editing, and song / playlist / lighting authoring — every write is
  parse-validated before it touches disk, and patch-style string-replacement edits are
  supported alongside full-file writes. Two live resources, mtrack://status and
  mtrack://config, can be subscribed to for push updates. An optional bearer_token
  enforces Authorization: Bearer (constant-time comparison) for non-localhost binds, and
  idle sessions are evicted after a configurable timeout (idle_session_timeout_secs,
  default 4 hours). See the new MCP Control documentation.
• Pre-built release binaries: Tagged releases now build and attach binaries for x86_64 and
  aarch64 Linux and Intel/Apple Silicon macOS, packaged as tarballs with SHA-256 checksums.
• cargo binstall support: cargo binstall mtrack fetches the pre-built release binaries
  instead of compiling from source.

Changed

• Audio decoding migrated to Symphonia 0.6: Adopts Symphonia's reorganized decode/seek API
  and strengthens decode coverage with cross-format sample-value tests (lossless formats must
  decode bit-exactly) so the migration is trustworthy across WAV, FLAC, MP3, Ogg Vorbis, and AAC.
• Lock-free audio read path: BufferedSampleSource now uses an rtrb single-producer/
  single-consumer ring instead of a mutex+Condvar, so the realtime cpal callback holds no buffer
  lock and is no longer exposed to priority inversion.
• Dependency updates: Routine refresh of the Rust and web-UI dependency trees, including
  rubato 1→3, Tokio, rustls, vite 6→8 (Rolldown bundler), TypeScript 5→6, and
  @sveltejs/vite-plugin-svelte 5→7. Resolves all outstanding cargo audit and npm audit
  advisories.

Fixed

• Sample-accurate, glitch-free section loops: One-measure section loops now restart exactly
  on the measure boundary with a single clean downbeat, eliminating the audible jitter and stutter
  at the loop point. Loop-back sources are prebuilt off-thread and speculatively prewarmed so the
  boundary is hit precisely the instant a loop is armed.
• Sample-accurate seeking for lossy and block codecs: Seeking now lands sample-accurately
  across WAV, FLAC, MP3, Ogg Vorbis, and AAC by pre-rolling a margin before the target to warm the
  decoder and anchoring the discard to the first decoded packet's timestamp. Previously MP3/AAC
  showed a few ms of warmup corruption and Vorbis a persistent ~6 ms position offset after a seek.