Drive the real PromptSession that run() builds (real key bindings + RawCompleter +
complete_while_typing) via a prompt_toolkit pipe input simulating TTY keystrokes, so
the actual rawcli input stack is exercised, not just the handler in isolation. Asserts
every input path yields the correct accepted line (hex byte line, binary via toggle,
mixed hex/binary, function call, command name) and that the completer is queried live
during binary entry (0 queries before the autocomplete fix, since buf.document= reset
complete_state).
prompt()'s internal asyncio.run() nulls the current-loop pointer; the helper saves and
restores it so the shared-loop `_run` convention in other test files is not poisoned.
Full suite stays green (1383).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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