Record the 60-90 second disposable-account project demo

[darkbyte-JS]

Goal

Produce the short installation, profile, passkey registration/authentication, TPM-status, lock/unlock demonstration described in docs/DEMO-SCRIPT.md.

Acceptance criteria

• Use a disposable Windows and website account.
• Show the self-signed beta warning and provider enablement honestly.
• Redact browser tabs, profile names, keyfiles, recovery codes, and account identifiers.
• Add the final video link near the top of the README.