fix: simplify the RDP buyer presentation

[abrichr]

Summary

• remove the duplicate compiled-workflow sequence from the real generated RDP video
• reduce the video from 52.3 seconds to 38.9 seconds
• use four buyer stages: Request, Demonstrate, Execute, and Verify or stop
• keep the exact workflow graph open below the video as the single detailed program view
• label the graph as an exact exported artifact instead of a media-synced animation
• update the exact media timeline, manifest, and public JSON hashes

Verification

• all 183 unit tests pass
• exact reference presentation verification passes
• the production Next.js build passes
• the new MP4 has 467 exact decoded frames at 12 FPS
• the timeline covers every video frame and contains no inferred graph timing

Flow PR #326 updates the source renderer so this public asset remains reproducible.

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