fix: harden phase summary open questions

harness/.pi/extensions/gate/__tests__/artifact_contracts.test.js

@@ -151,6 +151,22 @@ test("validatePhaseSummaryV2: rejects a section missing title or items", () => {
   assert.ok(out.errors.some((e) => /sections\[0\].*title/.test(e)));
 });
 
+test("validatePhaseSummaryV2: rejects structured open_questions instead of crashing the UI", () => {
+  const out = validatePhaseSummaryV2({
+    schema_version: 2,
+    summary: "s",
+    open_questions: [
+      {
+        label: "pazienti_finale restituisce 0 righe",
+        question: "Verificare se i filtri sono troppo restrittivi",
+      },
+    ],
+  });
+
+  assert.equal(out.ok, false);
+  assert.ok(out.errors.some((error) => /open_questions\[0\]/.test(error)));
+});
+
 test("validatePhaseSummaryV2: permissive on extra unknown fields", () => {
   const out = validatePhaseSummaryV2({ schema_version: 2, summary: "s", extra_field_from_model: "whatever" });
   assert.equal(out.ok, true);

harness/.pi/extensions/gate/artifact-contracts.js

@@ -115,6 +115,17 @@ function validatePhaseSummaryV2(data) {
 	if (data.tables !== undefined && !isArray(data.tables)) {
 		errors.push("tables deve essere un array se presente.");
 	}
+	if (data.open_questions !== undefined) {
+		if (!isArray(data.open_questions)) {
+			errors.push("open_questions deve essere un array di stringhe se presente.");
+		} else {
+			data.open_questions.forEach((question, i) => {
+				if (typeof question !== "string") {
+					errors.push(`open_questions[${i}] deve essere una stringa.`);
+				}
+			});
+		}
+	}
 	return { ok: errors.length === 0, errors };
 }