docs: regenerate from USER_GUIDE at v0.111.0
Drop USER_GUIDE section numbers from wiki headings + fix anchors The guide's ## N. numbering (10b, 6b, 7b...) made no sense once the sections were split across thematic wiki pages - no 10a, no context. Stripped the numeric prefixes from every heading and updated the intra-wiki anchor links that referenced them.
Add ssh-tool user guide (generated from docs/USER_GUIDE.md) + screenshots