#8 feat: adopt typed yt-dlp broker and handle adaptive audio

Summary

• migrate download operations to the typed yt-dlp host contract
• route adaptive audio-only streams through host-managed extraction instead of returning raw HLS
• add complete WASM ABI smoke coverage and pinned reproducible CI
• use upstream Extism 1.30.0

Validation

• 103 unit tests and 4 WASM smokes pass
• native and WASM Clippy pass with warnings denied
• release WASM build and cargo audit pass

Linear: MAT-129, MAT-131

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Summary by cubic

Moves Vimeo downloads to the typed run_ytdlp broker and ensures resolve_stream_url never returns HLS, routing adaptive audio/video through the host for safer, more reliable downloads. Adds release-WASM ABI smokes with extism 1.30.0, pins/repins reusable CI/release workflows, and restricts releases to the repository owner.

• New Features

  • Migrated download_to_file from run_subprocess to the typed run_ytdlp contract; no argv building in WASM. (Linear: MAT-129)
  • Audio-only: return a dedicated audio URL when available; otherwise signal AdaptiveStreamOnly so the host calls download_to_file. Added resolve_audio_only_url and tests. (Linear: MAT-131)
  • Added release-WASM ABI smoke tests; split Plugin CI into verification and release jobs; repinned canonical workflows and rust-toolchain.

• Migration

  • Requires Vortex host ≥ 0.2.0 with http_request, get_config, and the typed run_ytdlp broker enabled; plugin.toml continues to declare subprocess = ["yt-dlp"].
  • Hosts must call download_to_file when resolve_stream_url returns AdaptiveStreamOnly; HLS manifests are no longer returned.

Summary by CodeRabbit

• New Features

  • Added support for Vortex 0.2’s typed media-download integration.
  • Improved audio-only stream resolution and adaptive-stream handling.
  • Updated plugin compatibility to Vortex 0.2.0 and released version 1.4.0.

• Bug Fixes

  • Improved validation of audio-only media variants and download requests.

• Tests

  • Added end-to-end WebAssembly smoke tests covering routing, metadata, media, downloads, and playlist behavior.

• Documentation

  • Updated requirements, testing instructions, and changelog details.