fix(build): remove non-functional smoke test from package-mac-app.sh

The --smoke qr argument was removed from the relay CLI, but the smoke
test remained in the macOS app packaging script. This caused the build
to fail with exit code 1 when the bundled relay didn't recognize the
argument.

Removes the 2-line smoke test section to fix the build.

Fixes #317

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/package-mac-app.sh

@@ -272,8 +272,6 @@ if [[ "${SKIP_GATEWAY_PACKAGE:-0}" != "1" ]]; then
   fi
   rm -rf "$RELAY_BUILD_DIR"
 
-  echo "🧪 Smoke testing bundled relay QR modules"
-  "$RELAY_OUT" --smoke qr >/dev/null
 
   echo "🎨 Copying gateway A2UI host assets"
   rm -rf "$RELAY_DIR/a2ui"