Start from the real task
When `.html` and extensionless versions of the same page are both discovered, internal links, canonical tags, sitemap entries, and redirects should converge on one default entry point.
Point topic pages, about pages, and resource links to extensionless URLs so search systems and readers see one memorable path.
A case is not yet a market
The signal matters when it clarifies a real service task, deliverable, and acceptance rule, not when it only shows a demo.
Check the delivery boundary
- Inspect archive, toolkit, and daily links for remaining `.html` topic links
- Keep the test narrow: one service scenario with clear inputs, deliverables, acceptance rules, and human review
What still needs proof
Fragmented entry points split click promises, links, and discovery signals across duplicate paths. Keep the original source open so the announcement, the evidence, and this site's interpretation stay separate.