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Adds `buildCaptionModel` to the caption parser — groups TranscriptWord arrays into CaptionGroups (default 5 words each), creates CaptionSegments with correct timing and groupIndex, and wires in DEFAULT_STYLE, DEFAULT_CONTAINER, and DEFAULT_ANIMATION_SET. Covers 23 tests (13 new). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>