docs: close out MS16+MS17 mission

Mark acceptance criteria 14-28 as DONE, add MS16+MS17 to Completed Work
section, update resolved risks/open questions, close issue #469, finalize
manifest and scratchpad with smoke test confirmation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/next-env.d.ts

@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/dev/types/routes.d.ts";
+import "./.next/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.