Catch agent loops: compare screens by thumbnail, count repeated actions; fix back on in-page navigation; simpler Docling task

Prepare for public launch: README and title, SafeSearch and family-DNS filter, friendly quota message, Triton tuning cache, 4 browsers, shorter suggestions

Web agent view (Qwen3.6-27B-FP8 planner + DeskForge-Qwen3.5-4B) on top of the live desktop duel