Comment mode shipped the crop and the note, so an agent got a picture of the
problem and had to grep for the element it showed. Each element comment now
also names its CSS selector, its markup, and the computed styles that decide
layout, which is what the agent needs to land in the right file.
The target line stays prose — it is what the user pointed at — and the DOM
detail rides labelled lines beneath it. Area pins have no element, so they
still get only the crop and the note.
Markup is redacted in the guest before it crosses to the host: password and
hidden input values, and any attribute reading as a key/token/secret, are
replaced with [redacted] on a clone, so a page's secrets never reach the
composer or the model. It is clipped to a 600-char budget so one comment
cannot paste a whole section.
AnnotateIdentity was a hand-copy of CompactIdentity that had already drifted;
it is now an alias, so the guest, the pin, and the packer cannot disagree
about the shape again.
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