docs: close item 36, narrow item 66 with a negative result

Item 36's section moves to the closed file and its three traps go into
CLAUDE.md, which is where they will be read: the worker is unreachable
by findChild, rowCount on an unexpanded thread row is 0 by design, and
currentThreadId reports intent rather than content.

The claim that this class of bug cannot be reproduced in test_mainwindow
is now false, so it is corrected rather than left standing beside its
replacement. One in-test reference to item 36 as a permanent limitation
is reworded: bare-window cases still have no worker, but that is now a
choice per case rather than a property of the binary.

Item 66 stays open with the simple case ruled out. The negative result
sharpens this entry's own candidate rather than contradicting it: the
test drives setCurrentIndex, which updates the selection model
synchronously, while the suspect guard turns on a real click not having
done so yet. Two cheaper conditions are named as still unexcluded.

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

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