docs: mark GLOBAL-SPRINT-PLAN housekeeping checklist complete

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/GLOBAL-SPRINT-PLAN.md

@@ -44,8 +44,8 @@ Supersedes `docs/COMING-SOON-AUDIT.md` §5 sprint breakdown. One consolidated tr
 
 ## Housekeeping
 
-- [ ] Delete `docs/COMING-SOON-AUDIT.md`
-- [ ] Fold summary into `docs/KNOWN-ISSUES.md` "Fixed (this cycle)"; remove the `HeaderConfig.showProfile` dead-toggle entry from "Open"
-- [ ] Update `docs/BACKEND.md` (and `docs/backend/BACKEND-INTEGRATION.md` if applicable) for `tenant.documentationUrl` only, if added
-- [ ] `npm run barry -- validate`
-- [ ] Typecheck touched files
+- [x] Delete `docs/COMING-SOON-AUDIT.md`
+- [x] Fold summary into `docs/KNOWN-ISSUES.md` "Fixed (this cycle)"; remove the `HeaderConfig.showProfile` dead-toggle entry from "Open"
+- [x] Update `docs/BACKEND.md` (`tenant.documentationUrl` field added §1.3; no `docs/backend/BACKEND-INTEGRATION.md` exists in this repo)
+- [x] `npm run barry -- validate` (clean, only pre-existing unrelated warnings)
+- [x] Typecheck touched files (`tsc --noEmit` + full `ng build` both clean)