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Documents DocumentTitleFormatter in the document-management C4 diagram and adds
an "honest precision display" row to the CONTRIBUTING date-handling table,
pointing at formatDocumentDate / <DocumentDate>, the shared
docs/date-label-fixtures.json drift guard, and the {@html} escaping rule.
Closes #666
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>