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`make fmt` formatted only Go, so the org's Markdown settings were unenforced and Markdown was wrapped by hand. prettier, pinned in `package.json` and `yarn.lock` beside ESLint, now formats the Markdown with `.prettierrc` (4-space tabs, `proseWrap: always`). It runs only in Docker: `make fmt` writes the formatted files back without a bind mount, and `make fmt-check`, `make check` and the image build fail on unformatted Markdown. The image build's lint stage now runs the Go format check directly and no longer installs `make`. `README.md` and `TODO.md` are reformatted with no word changed: the README reflows from 72 to 80 columns. Model: opus-5-5