feat(installer): add --install/--uninstall with recorded full rollback

docs/INTEGRATION.md

@@ -32,7 +32,16 @@ You can merge this snippet manually into your `openclaw.json`.
 For production-like install with automatic rollback on error:
 
 ```bash
-./scripts/install-whispergate-openclaw.sh
+./scripts/install-whispergate-openclaw.sh --install
+```
+
+Uninstall (revert all recorded config changes):
+
+```bash
+./scripts/install-whispergate-openclaw.sh --uninstall
+# or specify a record explicitly
+# RECORD_FILE=~/.openclaw/whispergate-install-records/whispergate-YYYYmmddHHMMSS.json \
+#   ./scripts/install-whispergate-openclaw.sh --uninstall
 ```
 
 Environment overrides:
@@ -48,7 +57,10 @@ Environment overrides:
 The script:
 - writes via `openclaw config set ... --json`
 - creates config backup first
-- restores backup automatically if any step fails
+- restores backup automatically if any install step fails
+- writes a change record for every install/uninstall:
+  - directory: `~/.openclaw/whispergate-install-records/`
+  - latest pointer: `~/.openclaw/whispergate-install-record-latest.json`
 
 ## Notes