Laying out type (show, stringwidth, cshow) costs about 300 operations plus
64 a character, measured, and now counts that much against MAX_OPS: a
300-byte file running cshow over a 4 MB string took 60 s, and
{ (a) stringwidth pop pop } loop ran for over 5 minutes (already the case on
main); both now stop with "the program runs too long" within seconds.
Tests: executable filters run inside themselves stop at the nesting limit
(directly, mutually and under stopped), currentfile cvx exec runs nothing
twice, cshow over a long string is refused; the hostile PostScript fuzz
tokens gain self-recursive filter execution, currentfile filters, cvlit and
cshow.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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