multiline output (e.g. man, bare-slice pager) matches real PTY behavior and
avoids misaligned lines vs the peer terminal.
Mirror pty-req TERM and dimensions into forked session vfs.env (COLUMNS,
LINES) when bareOsForkShellEnv is used; clear target on session end.
Add bare-openssh-pty-console helper module and brittle tests; re-export
formatter from bare-openssh for API parity.
