Code-review feedback on Task 1: the _HTML suffix makes the 'this is raw
HTML, do not escape' contract obvious at every call site. Cheap to do
now (zero consumers); would be 8 diffs once Tasks 4-6 wire the constant
into the type forms.
Plan updated in lockstep so Task 4 references the new name.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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