feat(bin): run impeccable URL scans on Browserless on flowstate-remote

impeccable-browser stands in for Chrome via IMPECCABLE_BROWSER. Public
URLs render on Browserless with the key from the Reoclo project
flowstate-tools; localhost and private origins reach it through a
cloudflared quick tunnel that lives only for the scan, with the CDP
traffic rewritten so reports name the local URL. Anything else, or a
failed tunnel or Browserless connection, falls back to local headless
Chrome with --no-sandbox.

It is Linux only, so setup-mac.sh does not link it.

setup-mac.sh

@@ -198,6 +198,7 @@ step_links() {
         name=${script##*/}
         case $name in
             pbcopy | pbpaste) continue ;; # OSC 52 clipboard shims for headless servers
+            impeccable-browser) continue ;; # Linux-only browser shim for flowstate-remote
         esac
         if [[ -x $script ]]; then link ".local/bin/$name" ".local/bin/$name"; fi
     done