docs: sync wiki from 0a02b59
docs: sync wiki from b974243
Sync from master (de-ENC rename + district ground material)
Sync from master (the double-applied offset correction)
Sync from master (the preview truth arc)
Sync from master (donor-clip placement note)
Sync wiki from docs/ (cliff anticipation)
Sync wiki from docs/ (flight character)
Sync wiki from docs/ (per-model turn ease + terrain hug)
Sync wiki from docs/ (terrain hug)
Sync wiki from docs/ (donor-clip flight + turn ease, Editor-Tools, Headless-CLI; sidebar updated)