Add preview pack smoke gate

tests/scripts/npm-publish-surface.test.js

@@ -59,6 +59,7 @@ function buildExpectedPublishPaths(repoRoot) {
     "scripts/observability-readiness.js",
     "scripts/operator-readiness-dashboard.js",
     "scripts/platform-audit.js",
+    "scripts/preview-pack-smoke.js",
     "scripts/skill-create-output.js",
     "scripts/repair.js",
     "scripts/harness-adapter-compliance.js",
@@ -129,6 +130,7 @@ function main() {
         "scripts/consult.js",
         "scripts/discussion-audit.js",
         "scripts/operator-readiness-dashboard.js",
+        "scripts/preview-pack-smoke.js",
         "scripts/work-items.js",
         "scripts/platform-audit.js",
         ".gemini/GEMINI.md",