fix: [verified] expose all documentation in reachable sidebars

docs/core/maintain.md

@@ -29,6 +29,9 @@ Include `title` and `description` frontmatter. Place each page in its owning sec
 | Portal maintenance and reference | `docs/core/` | `sidebars.ts` |
 
 Keep these content roots disjoint. Preserve existing URLs when moving pages. Specific AI initiatives and organizational reporting lines remain subject to agreement.
+Every published documentation page must have a navigable sidebar entry. Nested references are welcome; hidden documentation is not. Linked category overviews count as entries, but an in-page anchor is not a separate document. Portal-maintenance pages keep their existing `/docs/` routes and dedicated sidebar, reachable from Contribution → Portal maintenance.
+
+`pnpm verify:build` compares all Docusaurus-generated document IDs/routes with resolved sidebar trees (including linked category overviews), checks reachability from the navbar, rejects missing/duplicate entries and unclassified HTML routes, and checks every document’s local links and anchors. The inventory is written to `.cache/sidebar-coverage.json`. Only the homepage, not-found page, search-results UI, legacy Strategy redirect and standalone diagram viewers are non-document HTML routes; no documentation page is exempt.
 
 ## Validate the change