Fix PIN prompt and Ctrl+C behaviour in shell

PIN prompt: replace readline.ReadPassword (which silently failed to
display the prompt before the process was fully interactive) with
golang.org/x/term.ReadPassword, which reliably disables echo and prints
the prompt via a plain fmt.Print before reading. This fixes the root cause
of the decryption failures — the user was never prompted for their PIN,
so an empty/default PIN was used, producing a wrong IV.

Ctrl+C: return io.EOF from Shell.ReadLine on readline.ErrInterrupt so
that pressing Ctrl+C exits the shell loop, matching the Ruby behaviour
where SIGINT terminates the process.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions