Add AGENTS.md with Cursor Cloud dev environment instructions

AGENTS.md

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+# AGENTS.md
+
+## Cursor Cloud specific instructions
+
+### Overview
+
+This is a **static localization/i18n repository** for the Moot forum platform. It contains plain JavaScript locale files (26 languages, ~52 `.js` files) and a `test.html` browser harness. There is no build system, no package manager, no linter, and no automated test suite.
+
+### Running the dev server
+
+Serve the repo root with any static HTTP server. For example:
+
+```
+python3 -m http.server 8080 --directory /workspace
+```
+
+Then open `http://localhost:8080/test.html?<lang>` (e.g. `?en`, `?fr`, `?ru`) to preview a language.
+
+### Key caveats
+
+- **No `package.json`, no npm/pnpm/yarn.** Do not attempt to run `npm install` or similar.
+- **External CDN dependency.** `test.html` loads jQuery and the Moot widget JS/CSS from `cdn.moot.it` and `ajax.googleapis.com`. The Moot forum widget will not render without network access to these CDNs; however the language file loading and the header UI still work locally.
+- **No linting or automated tests.** Validation is manual: open `test.html?<code>` in a browser and visually inspect the translated strings.
+- **File encoding must be UTF-8.** See the README for `iconv` commands to fix encoding issues.
+- Each language has two files: `<lang>.js` (main UI strings) and `<lang>.auth.js` (authentication dialog strings).