- bracketed_paste(+Input, +Char, -Continue) is det[private]
- Handler for the bracketed paste start sequence ESC[200~. Reads
characters until the end sequence ESC[201~ is received and inserts
the collected text literally, bypassing per-character key dispatch.
The terminal is asked to enable bracketed paste mode (ESC[?2004h) from the C layer each time a prompt is issued.