v0.1.0

detachproc: transparent detached-PTY session holder

Run a command on a detached PTY and reattach with fully transparent I/O —
no escape-sequence parsing, so mouse reporting and bracketed paste pass
through untouched. One client at a time; a new attach steals the session.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>