tweaks

README.md

@@ -2,6 +2,24 @@
 
 Open `index.html` in a browser.
 
+Production uses the committed `dist/game.js` bundle. Edit source files under
+`src/`, then run `npm install` once and `npm run build` after JavaScript
+changes to regenerate the bundle.
+
+## Static server cache setup
+
+Serve `index.html`, the bundled JavaScript, and CSS with cache validation
+instead of import query strings. This prevents stale files while keeping reloads
+fast.
+
+Use the example in `deploy/` for your HTTP server:
+
+- nginx: include `deploy/nginx-cache.conf` inside the server block.
+- Apache: copy or include `deploy/apache-cache.htaccess` from the site root.
+- Caddy: adapt `deploy/Caddyfile-cache`.
+
+After deploying, purge any CDN or reverse-proxy cache once.
+
 ## Current baseline
 
 - Build, move, box-select, sell, and repair factory equipment during Build phase.