Homepage: restore per-tool evidence as a tabbed showcase

The tools section shows neatlogs, Entire and cfo.ai as tabs on a neutral band. Each tab has a role line and three numbered proofs: a focused screenshot, one caption with a real number, and a link to the source of truth. The cfo.ai tab adds two real captures of the public model and a cash chart drawn from docs/data/cfo-model.json. Without JS every tool and screenshot is stacked. Deep links such as #tools-entire open their tab.