feat(installer): add openclaw config-set installer with automatic rollback

docs/INTEGRATION.md

@@ -27,8 +27,30 @@ The script prints JSON for:
 
 You can merge this snippet manually into your `openclaw.json`.
 
+## Installer script (with rollback)
+
+For production-like install with automatic rollback on error:
+
+```bash
+./scripts/install-whispergate-openclaw.sh
+```
+
+Environment overrides:
+
+- `PLUGIN_PATH`
+- `NO_REPLY_PROVIDER_ID`
+- `NO_REPLY_MODEL_ID`
+- `NO_REPLY_BASE_URL`
+- `NO_REPLY_API_KEY`
+- `BYPASS_USER_IDS_JSON`
+- `END_SYMBOLS_JSON`
+
+The script:
+- writes via `openclaw config set ... --json`
+- creates config backup first
+- restores backup automatically if any step fails
+
 ## Notes
 
-- This repo does not run config mutation commands.
 - Keep no-reply API bound to loopback/private network.
 - If you use API auth, set `AUTH_TOKEN` and align provider apiKey usage.