A document can forge both a console message and its source (KaTeX's
\errmessage, data: scripts, sourceURL, encoded paths), so the display
handler logs a line number and nothing the page wrote. The page's own
diagnostics reach the app over elyQuery: a missed reveal sends its
line; the visual failure and diagram lines already did. A test calls
the real handler and checks the captured log.
Round 5 found only the missing test; it is added and mutation-checked,
with no sixth review under the five-round cap. M-15 is new: the print
page runs a document's scripts.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ZacharyZhang-NYandClaude Opus 5.5
c5cb153f72