docs: publish final CipherBid demo video

[SourceSenseiTheRealOne]

Publishes the verified final YouTube video and closes the submission metadata.

• final URL: https://youtu.be/pYZk6KXko7o
• public playback ready with no player error
• duration: 144.861 seconds
• five qualifying STRK20 transactions remain unchanged
• README, evidence, and official requirements matrix updated

No product, wallet, contract, or chain-execution logic changes.

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