Deploy main eacf1e7 to prod

Replaces #559, which conflicted.

Model: opus-5-5

eslint.config.mjs

@@ -0,0 +1,18 @@
+// ESLint configuration for static/js/. script/lint and the image build run
+// ESLint in the Dockerfile's js-lint stage, never on the host.
+//
+// The rules are the ones the JavaScript styleguide linked from
+// REPO_POLICIES.md states that a linter can check: const for everything,
+// let only for a variable that is reassigned, never var.
+export default [
+    // Alpine.js, extracted from 3p/ by make assets; not ours to lint.
+    { ignores: ["static/js/alpine.min.js"] },
+    {
+        // The pages load static/js/app.js as a classic script, not a module.
+        languageOptions: { sourceType: "script" },
+        rules: {
+            "no-var": "error",
+            "prefer-const": "error",
+        },
+    },
+];