docs: add Cursor Cloud specific setup instructions to AGENTS.md (#77)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Piotr Wodecki <PiotrWodecki@users.noreply.github.com>

Author: PiotrWodecki

AGENTS.md

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+# examples
+
+A collection of ~20 example apps demonstrating Fishjam SDKs, grouped under `mobile-react-native/`, `web-react/`, `web-ts/`, plus standalone demos (`deep-sea-stories`, `gemini-demo`, `moq-demo`, `translation-demo`).
+
+## Cursor Cloud specific instructions
+
+Node (via nvm) and Corepack are pre-installed. Each app is an independent project (mostly Yarn Berry; `fishjam-react-native-webrtc`-style apps may use npm) — install per app directory (`yarn install` / `npm install`) as needed.
+
+- Validated across all 20 apps: dependency install succeeds, and the best available check per app passes — web apps via `yarn build`, TS libs via `yarn typecheck`, React Native apps via `yarn lint` (native iOS/Android builds are not possible headless). `mobile-react-native/common` is a shared library with no validation script.
+- The apps are demos that need a running Fishjam backend (and API keys, e.g. Gemini for `gemini-demo`) configured via each app's env to actually connect; build/typecheck/lint work standalone.