Deploy main 5e572ce to prod (#198)

main's tree, with next merged on 26 October, as one commit onto prod, on sneak's order.

Model: opus-5-5
Co-authored-by: clawbot <clawbot@noreply.example.org>

script/frontend-fmt

@@ -1,14 +1,16 @@
 #!/bin/sh
-# script/frontend-fmt: format the frontend and every other file prettier
-# understands, repo-wide (writes). backend/ is in .prettierignore; Go
-# sources are formatted by backend/script/fmt.
+# script/frontend-fmt: format the JavaScript, CSS, HTML and Markdown,
+# repo-wide (writes). Those are the languages REPO_POLICIES.md gives
+# prettier; the YAML is left alone, as .golangci.yml must stay the org
+# standard byte for byte. Prettier does not read Go; script/fmt runs
+# gofmt over the Go sources.
 set -eu
 
 ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
 
 main() {
     cd "$ROOT"
-    yarn prettier --write .
+    "$ROOT/script/yarn" prettier --write '**/*.{js,css,html,md}'
 }
 
 main "$@"