Evidence-visible design

Build a single-file data tool from one sentence (a review queue, a ledger, a tracker, an admin panel) in a design system where every number shows where it came from and what was not checked. The page carries provenance chips beside derived values, a reconciliation bar on the first screen whose parts are computed live and add up, a fixed status vocabulary that never relies on colour alone, a Demo marker for synthetic data and a footer that says what is not verified. Three palettes and light/dark come from one token file, restored before first paint. Ships the token file, a working starter page and scripts/ui_check.py with fifteen machine rules. Use when asked for a dashboa…