Passkey handshake adaptation from vinikjkkj, WhiskeySockets/Baileys PR #2689.
Original commits e5abc69fbabbc82709e6fd84e1bcb83d02a9ae14 and c3d846d68b1a40331687b66bcc8971679ef9af00.
Modified for Hermes: the code-matching step waits for owner confirmation when no
trusted pairing handoff applies (upstream always auto-confirms); a newer prologue
or socket close cancels the pending attempt; only server-origin notifications are
handled; unused extension points were removed.

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