feedback5 R6: add a player package tool with a lite dry-run

tools/package.mjs packs git-tracked runtime files and production dependencies. --lite leaves out local art, fonts and the local asset manifest. --dry-run lists the files and the uncompressed sizes and does not write a zip.

package.json

@@ -37,7 +37,9 @@
     "launch": "node scripts/launch.mjs",
     "lint": "eslint .",
     "typecheck": "tsc --noEmit --checkJs -p jsconfig.json",
-    "check:imports": "node tools/check-imports.mjs"
+    "check:imports": "node tools/check-imports.mjs",
+    "package": "node tools/package.mjs",
+    "package:lite": "node tools/package.mjs --lite"
   },
   "engines": {
     "node": ">=22"