Visual regression coverage

The question this skill answers is "if this file's rendering changes, does a Chromatic snapshot catch it?". The answer is a static fact about the repo, so a script computes it. Do not answer it by reading the Chromatic check, and do not answer it from memory.

Run the check

pnpm visual-coverage --changed                # files changed vs origin/main, including uncommitted
pnpm visual-coverage --changed --prs          # also mark files that an open PR is about to cover
pnpm visual-coverage <path> [<path>...]       # specific files
pnpm visual-coverage                          # whole tree, one row per area
pnpm visual-coverage --uncovered              # whole tree plus every uncovered file
pnpm visual-coverage --format json ...        # machine-readable, same modes
pnpm visual-coverage --help