Manual comparison driver

For each commit, install with vp i and start a fresh web dev server with T3CODE_DEV_SEED=0 T3CODE_PORT_OFFSET=720 T3CODE_TAILSCALE_SERVE=1 T3CODE_TAILSCALE_SERVE_PORT=8443 vp run dev.
Pair the browser using the startup admin pairing URL. Wait for pairing to finish before navigating to http://localhost:6453/settings/access.
Use the same browser viewport and light theme. Read the Enable network access switch's aria-checked value.
Verify a real HTTPS GET to the Tailscale Serve endpoint /.well-known/t3/environment returns the same environmentId as the local server. No mocked endpoint or policy.
Take two screenshots at least 500ms apart and compare pixel equality. Crop the unchanged Network access row from each to exclude the environment's private machine name; do not alter row content.
Stop the first server before starting the second so both use the same ports and origin.