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CONTRIBUTING.md

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+# Contributing
+
+Work locally, keep changes focused, and test in Home Assistant before opening a
+pull request.
+
+- Use clear commit messages.
+- Do not commit Home Assistant tokens, camera proxy tokens, SSH keys, or local
+  deployment notes.
+- Keep the integration domain as `elegoo_spaghetti_detection`.
+- Validate JSON, YAML, Python syntax, HACS, and Hassfest before opening a pull
+  request.
+
+## Local Validation
+
+```bash
+python -m json.tool hacs.json > /dev/null
+python -m json.tool custom_components/elegoo_spaghetti_detection/manifest.json > /dev/null
+python -m compileall custom_components/elegoo_spaghetti_detection addon/rootfs/app
+```
+
+The GitHub workflows run the full repository checks.