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Three new HyperFrames-specific skills: - captions: Build timed caption compositions from whisper.cpp transcripts. Covers word grouping, animation patterns, positioning, and timing rules. - transitions: Scene transition constraints and patterns (crossfade, wipe, scanline). Covers track overlap rules and relative timing. - media: Video, audio, and image handling constraints. Covers codecs, transparent video, trimming, PiP, and the framework playback contract. Also adds design spec for CLI transcription feature (future work). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>