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Introduces ShakaVideoSession (libs/ui/playback/src/lib/shaka-engine/): a lazily imported shaka-player engine (separate lazy chunk, ~217 KB transfer) owning attach/configure/load with an operation queue and generation guard against channel-switch races. Channel ClearKey config maps to drm.clearKeys; channels with an unsupported license type emit a DrmOrEncryption diagnostic without starting an engine. Shaka errors are classified into the existing playback diagnostics (PlaybackDiagnosticSource.Shaka). Wires the engine into both built-in players like hls.js/mpegts.js: - HTML5: extension === 'mpd' branch in playChannel(); hls/mpegts/native glue extracted to helpers to keep the component within the size budget - ArtPlayer: customType 'mpd' in ArtPlayerSourceSession (+ getDrm seam) - Shared controls: WebVideoControlsSource kind 'shaka' + WebVideoShakaControls using the Shaka 5 text model (selectTextTrack(null) hides subtitles; Player.setTextTrackVisibility no longer exists) Adds a CJS shaka-player jest stub (video.js precedent) for web specs. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>