Consolidate the 13 findings + learnings from the Wiki.js AAR into
docs/wiki/stolpersteine/wikijs.md (config/deploy, theming, navigation,
locale/timezone incl. the standing fork patch, access control, git-storage),
link it from the wiki index, and set the AAR status to harvested.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
