- Archive August 2026 Gridfinity Extravaganza - Set September 2026 Practi"FALL" Prints as active challenge - Set October 2026 as upcoming challenge - Create announcements/September2026.md and challenges/September-2026/ - Update Important-Dates, Readme, challenges.md, and sync wiki-content-gitea - Update wiki-fargo3d submodule pointer Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>