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Kam
b6e83c5e72
Two headings on the same page can generate the same anchor id, and every
link to it then resolves to whichever comes first. Nothing caught this
because the route manifest keeps anchors in a `Set`, so a repeat collapses
into one entry before any check runs, and the existing link validation only
asks whether an anchor exists, which a duplicate satisfies.
The generator now inspects each page's headings while they are still an
ordered list and fails with the offending pages and anchors. The scanning
and the duplicate check move to `heading.mts` so they are covered by tests
next to `getIdFromHeading`, which should keep this from coming back.
(cherry picked from commit 5e8a70a010)