Expect the found heading in the finding for '## What', an indented '### what', '#WHAT' and the existing '#### What' case, and no hint for a different word such as '### Whatever'.
Expect 'fill the ### What section' for the untouched template and for sections that are blank or only hold a comment, and 'add the ### What heading of the template' for a heading written at another level. Add a body that names its sections without headings, the shape that failed #10721 at first, and expect one finding per missing heading.
Add tests for check_conventions.py's pull request checks: a filled-in
copy of the real template passes, the untouched template reports every
gap, unchecked items are named for any list marker, AI-assisted and
Depends on accept only their documented answers, template comments do
not count as answers, sections need content, and titles must follow
Conventional Commits.
MarcZX10