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Companion to presentation-modeling.md for streams that change over time (live / DVR / event). Spine is a category decomposition that keeps data separated by change-rate and consumer: content snapshot (snapshot/merge segment identity via media-sequence + URL/byteRange), streamType, completeness-as-duration, refetch policy as its own category, the PROGRAM-DATE-TIME sync anchor, and the derived consumer surface. Captures the debated decisions and open questions; scopes to sliding-window live (LL-HLS / DVR / discontinuity / timestampOffset deferred). Adds the reciprocal companion link in presentation-modeling.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>