fix(marmot-interop): clean up daemons on Ctrl+C in interactive harness

Apply the same SIGINT/SIGTERM/SIGHUP trap hardening to the interactive
harness that just landed on the headless one. Without it, killing the
script mid-run leaves the nohup'd wn daemons alive and the next run
fails in preflight because the sockets are still held.

tools/marmot-interop/marmot-interop.sh

@@ -925,7 +925,20 @@ test_14_push_notifications() {
 # ==== main ===================================================================
 
 main() {
-  trap 'stop_daemons; print_summary' EXIT
+  # Make sure Ctrl+C / SIGTERM / SIGHUP all run the full cleanup path —
+  # otherwise wnd is nohup'd and keeps running after the script dies.
+  # Trap INT/TERM/HUP forces `exit`, which triggers the EXIT handler once.
+  cleanup() {
+    local rc=$?
+    trap - EXIT INT TERM HUP
+    stop_daemons
+    print_summary
+    exit "$rc"
+  }
+  trap cleanup EXIT
+  trap 'exit 130' INT
+  trap 'exit 143' TERM
+  trap 'exit 129' HUP
   banner "Amethyst <-> whitenoise-rs interop harness ($RUN_TS)"
 
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