release-time updates: current release v26.04.20 Installation names v26.04.20 / 20 patches and bumps the NixOS rev; Troubleshooting's fallback answer covers the unbound horizontal flicks.
Auto-rotation: document the tablet-mode gate How the 2-in-1 gate behaves, the probed vendor sysfs switches, the NIRI_ROTATE_* overrides, and why unprivileged switch reading has to go through sysfs. Troubleshooting links it from 'auto-rotate does nothing'.
Updating/Troubleshooting: document the updater's config migration
gestures: tap-more/swipe-more-* rename, fingers 3-or-4, upgrade note The second tier applies at one finger more than fingers (4 by default) and fingers itself is now 3 or 4, hard-validated. Gestures and Configuration document the new semantics, Troubleshooting gains the v26.04.18 upgrade note (rename the old nodes or let EasySetup save), Home and Development follow, patch list gains 0019.
fix OSK page links: wikilink alias in github order (display|target)
fix OSK page links: .md suffix so github rewrites them to wiki urls
fix OSK page links: markdown links instead of wikilink aliases
populate wiki: installation, gestures, config, updating, osk, troubleshooting, development