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

CHANGELOG.md

@@ -10,6 +10,9 @@
 - Added helper scripts for smoke/dev lifecycle and rule validation
 - Added no-touch config rendering and integration docs
 - Added installer script with rollback (`scripts/install-whispergate-openclaw.sh`)
+  - supports `--install` / `--uninstall`
+  - uninstall restores all recorded changes
+  - writes install/uninstall records under `~/.openclaw/whispergate-install-records/`
 - Added discord-control-api with:
   - `channel-private-create` (create private channel for allowlist)
   - `channel-private-update` (update allowlist/overwrites for existing channel)