fix(gate): empty memory phase shows a notice and auto-advances instead of an empty checklist

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

@@ -0,0 +1,16 @@
+const test = require("node:test");
+const assert = require("node:assert");
+const { shouldSkipEmptyDecide } = require("../../tht-gate.js");
+
+test("skips the widget only when empty AND allow_empty AND advance", () => {
+  assert.equal(shouldSkipEmptyDecide({ meritCount: 0, allowEmpty: true, advance: true }), true);
+});
+
+test("does not skip when there are merito options", () => {
+  assert.equal(shouldSkipEmptyDecide({ meritCount: 2, allowEmpty: true, advance: true }), false);
+});
+
+test("does not skip when allow_empty is false or advance is false", () => {
+  assert.equal(shouldSkipEmptyDecide({ meritCount: 0, allowEmpty: false, advance: true }), false);
+  assert.equal(shouldSkipEmptyDecide({ meritCount: 0, allowEmpty: true, advance: false }), false);
+});

harness/.pi/extensions/tht-gate.js

@@ -267,6 +267,13 @@ export function resolveConfirmOutcome(resp) {
 	return { kind: "unknown", choice };
 }
 
+// True when a reviewer_decide has no merito options but is allowed to close empty
+// and advance (the empty memory phase F2). The gate then shows an info notice and
+// auto-advances instead of presenting an empty checklist.
+export function shouldSkipEmptyDecide({ meritCount, allowEmpty, advance }) {
+	return meritCount === 0 && !!allowEmpty && !!advance;
+}
+
 export async function emitAndWait(ctx, descriptor) {
 	for (;;) {
 		const value = await ctx.ui.input(JSON.stringify(descriptor), "");
@@ -524,14 +531,25 @@ export default function (pi) {
 			const { session, title, options: opts, advance } = params;
 			const phase = phaseId(ctx, currentPhase(ctx, session));
 			const toAdd = [];
+			const meritOptions = opts
+				.filter((o) => !isReserved(o.label))
+				.map((o) => ({ id: o.id, label: o.label }));
+			if (shouldSkipEmptyDecide({ meritCount: meritOptions.length, allowEmpty: params.allow_empty ?? false, advance })) {
+				await ctx.ui.notify(
+					"Nessuna memory riutilizzabile per questa domanda — passo alla fase successiva.",
+					"info",
+				);
+				advanceIfReady(ctx, session);
+				return textResult(
+					"Fase memoria vuota: nessuna decisione da registrare, avanzamento automatico alla fase successiva.",
+				);
+			}
 			const widget = buildMultiselectRequest({
 				id: `u${Date.now()}`,
 				phase,
 				title,
 				allowEmpty: params.allow_empty ?? false,
-				options: opts
-					.filter((o) => !isReserved(o.label))
-					.map((o) => ({ id: o.id, label: o.label })),
+				options: meritOptions,
 				recommended: opts.find((o) => o.recommended)?.id ?? null,
 			});
 			const resp = await emitAndWait(ctx, widget);