build: replace grunt with node terser script

PR-2 of the modernization plan: removes grunt + grunt-contrib-uglify in
favor of a ~50-line Node ESM build script that does what the gruntfile
used to do. Same dist layout, same banner format, no source changes.

scripts/build.mjs:
- Substitutes %version% from package.json into dist/jquery.autocomplete.js.
- Minifies via terser with a preamble that matches the gruntfile's banner
  format exactly (no leading-space, year 2025 hardcoded as before).
- Syncs version in devbridge-autocomplete.jquery.json.

devDependency churn:
- Drop: grunt, grunt-contrib-uglify (removed 96 transitive packages).
- Add: terser. vitest already pulled terser transitively, so dedupe lands.

Output:
- dist/jquery.autocomplete.js: byte-identical to pre-PR.
- dist/jquery.autocomplete.min.js: semantically equivalent. Terser 5
  emits ~73 bytes more than uglify-js 3 because it preserves slightly
  more local var names; tests still pass.

Lint/format scope broadens to scripts/build.mjs but deliberately excludes
the pre-existing demo files (scripts/countries.js, scripts/demo.js) which
are runtime assets loaded by index.htm, not build tooling.

Surviving npm audit advisories (6, all dev-only) are pre-existing and
unrelated to this PR; auto-fixable separately with npm audit fix.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: tkirda-bison

CLAUDE.md

@@ -10,9 +10,9 @@ This is a single-file jQuery plugin (Ajax Autocomplete). The entire implementati
 
 - `npm test` — Vitest run (headless, jsdom). Single-shot, exits nonzero on failure.
 - `npm run test:watch` — Vitest watch mode for local TDD.
-- `npm run lint` — ESLint (flat config in `eslint.config.mjs`) over `src/` and `test/`.
-- `npm run format` — Prettier rewrite of `src/` and `test/` (100-col, 4-space, ES5 trailing commas — config in `package.json`).
-- `npm run build` — `grunt build`: copies `src/jquery.autocomplete.js` to `dist/jquery.autocomplete.js` while substituting the `%version%` placeholder with `package.json` `version`, uglifies to `dist/jquery.autocomplete.min.js`, and syncs `devbridge-autocomplete.jquery.json` version. Run this before release/commit when source changes. *(Slated for replacement with a smaller Node script in the next modernization PR.)*
+- `npm run lint` — ESLint (flat config in `eslint.config.mjs`) over `src/`, `test/`, and `scripts/build.mjs`.
+- `npm run format` — Prettier rewrite of `src/`, `test/`, and `scripts/build.mjs` (100-col, 4-space, ES5 trailing commas — config in `package.json`). Demo files under `scripts/` (`countries.js`, `demo.js`) are intentionally excluded.
+- `npm run build` — runs `scripts/build.mjs` (Node ESM, no bundler): copies `src/jquery.autocomplete.js` to `dist/jquery.autocomplete.js` while substituting the `%version%` placeholder with `package.json` `version`, minifies to `dist/jquery.autocomplete.min.js` via terser with a fresh banner, and syncs `devbridge-autocomplete.jquery.json` version. Run this before release/commit when source changes.
 
 ## Tests
 

dist/jquery.autocomplete.min.js

@@ -35,4 +35,14 @@ export default [
             },
         },
     },
+    {
+        files: ['scripts/**/*.mjs'],
+        languageOptions: {
+            ecmaVersion: 2022,
+            sourceType: 'module',
+            globals: {
+                console: 'readonly',
+            },
+        },
+    },
 ];