Keep OpenClaw's gateway probes off the wizard's terminal

OpenClaw's CLI takes a terminal on stdin out of raw mode as it exits, and the onboarding watcher's `openclaw dashboard --json` probes inherited the wizard's terminal. Current releases write the config partway through the wizard, so the probes started while prompts remained, and every two seconds the terminal fell back to line mode: typing at the channel prompt echoed instead of selecting. The probes now read from /dev/null.

test/shell.d/openclaw-onboard-test.sh

@@ -55,6 +55,7 @@ onboard)
   while :; do sleep 0.2; done
   ;;
 dashboard)
+  printf 'dashboard-stdin:%s\n' "$(readlink /proc/$$/fd/0)" >>"$TEST_LOG"
   [[ -f $HOME/.openclaw/openclaw.json ]] && echo '{"ok":true,"port":18789}' || { echo '{"ok":false}'; exit 1; }
   ;;
 esac
@@ -63,7 +64,10 @@ chmod +x "$tmp_dir/bin/openclaw"
 
 start=$SECONDS
 rc=0
-"$ROOT/bin/omarchy-openclaw-onboard" </dev/null >/dev/null 2>&1 || rc=$?
+# A file stands in for the terminal the wizard reads, so where each probe's
+# stdin points can be told apart from it.
+: >"$tmp_dir/terminal"
+"$ROOT/bin/omarchy-openclaw-onboard" <"$tmp_dir/terminal" >/dev/null 2>&1 || rc=$?
 elapsed=$((SECONDS - start))
 
 grep -q '^openclaw:onboard --flow quickstart --install-daemon --skip-ui$' "$TEST_LOG" ||
@@ -76,6 +80,14 @@ grep -q '^terminated$' "$TEST_LOG" ||
 (( elapsed < 30 )) || fail "a wizard that lingers after the gateway is up is stopped and counts as success" "took ${elapsed}s"
 pass "a wizard that lingers after the gateway is up is stopped and counts as success"
 
+# OpenClaw's CLI takes a terminal on stdin out of raw mode as it exits, so a
+# probe that inherited the wizard's terminal would leave its prompts unable to
+# read keys. The wizard writes its config while prompts remain.
+grep -q '^dashboard-stdin:' "$TEST_LOG" || fail "gateway probes never read from the wizard's terminal" "no probe ran"
+! grep '^dashboard-stdin:' "$TEST_LOG" | grep -vqx 'dashboard-stdin:/dev/null' ||
+  fail "gateway probes never read from the wizard's terminal" "$(grep '^dashboard-stdin:' "$TEST_LOG" | sort -u)"
+pass "gateway probes never read from the wizard's terminal"
+
 # The wizard only starts being stopped once the gateway actually answers: a
 # stub that never writes the config is left alone and must be ended by its own
 # exit, not the watcher.