fix: mjs file is not binary data

I think I let Copilot write that.

Author: kgilpin

packages/cli/src/fulltext/FileIndex.ts

@@ -196,7 +196,6 @@ const BINARY_FILE_EXTENSIONS: string[] = [
   'jpg',
   'min.js',
   'min.css',
-  'mjs',
   'mkv',
   'mo',
   'mov',

packages/cli/tests/unit/fulltext/FileIndex.spec.ts

@@ -178,6 +178,7 @@ describe(filterFiles, () => {
       'large.haml',
       'large.java',
       'large.js',
+      'large.mjs',
       'large.ts',
       'large.txt',
     ]);