Text sent to a REPL is plain lines, sent whole or not at all

A CRLF became two line ends, the blank line ending a Python block; an ESC in
the text, ESC[201~ above all, could end a bracketed paste early; and on the
board, whose writes are 128 effects of 64 bytes with nothing pending, a send
past 8 KB was cut and lost its closing ESC[201~ and Enter, leaving the REPL
in a paste. Lines now end in LF alone, ESC and every control byte but tab and
newline are dropped, and a send larger than can be written at once
(Pardes.writeRoom) is refused with a message instead of cut.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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