Cryptext64 0.9 regression focus
===============================

Use disposable copies for every delete-path test.

Required:
- single encrypt + decrypt
- 0 / 1 / 4MiB / 4MiB+1 / >300MiB
- batch [x von y]
- phase rows: completed/current black, future gray
- cancel during phase 1 and phase 2
- collision -> Ja/Nein continuation
- access denied -> admin-rights hint
- wrong password / tampered .$#! -> auth prompt + no final plaintext
- auth failure followed by a valid same-password file -> valid file must still work
- keep-original checked and unchecked
- remembered password bullets still display without loading secret into active buffer

No CT64FILE-v1 byte-layout changes are expected in 0.9.
