Install / Upgrade VT Sentinel Plugin

This skill delegates everything to the official openclaw CLI. It does not delete files, edit openclaw.json manually, download tarballs from external URLs, or touch system services directly. All filesystem and config changes are performed by openclaw plugins subcommands.

What this skill will do

Before proceeding, tell the user the exact actions that will run, so they can approve:

1. Query installed plugins (openclaw plugins list) — read-only.
2. If not installed → openclaw plugins install clawhub:openclaw-plugin-vt-sentinel (downloads the verified ClawHub package into ~/.openclaw/extensions/).
3. If installed → openclaw plugins update openclaw-plugin-vt-sentinel (in-place upgrade handled by the OpenClaw CLI).
4. openclaw gateway restart — restart the user-scope gateway so the plugin loads.
5. Verify the plugin is active.