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Introduce media/presentation-anchor.ts realizing the single presentation-level anchor decision (internal/decisions/live-presentation-anchor.md): presentationAnchorFromBuffer / presentationAnchorEstimate derive the shared (media-time ↔ PDT) anchor — buffer-pinned, or the pre-buffer estimate — and positionTrackToAnchor re-origins any track onto it by its own per-segment PDT. Tested to generalize anchorTrackToBufferedSegment. Consumed by the anchor-live-tracks reactor conversion (next), which replaces the per-track anchor primitives. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>