fix: clarify memory selection semantics

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

@@ -386,6 +386,17 @@ export function shouldSkipEmptyDecide({ meritCount, allowEmpty, advance }) {
 	return meritCount === 0 && !!allowEmpty && !!advance;
 }
 
+// Phase 2 uses a single positive checkbox meaning: apply this memory now.
+// Candidates not checked by the reviewer remain undecided and may be shown again.
+export function memorySelectionWidgetProps(options) {
+	return {
+		title: "Seleziona le memory da applicare alla domanda",
+		selected: options.filter((option) => option.recommended).map((option) => option.id),
+		selectionLabel: "memory da applicare",
+		confirmLabel: "Applica le memory selezionate",
+	};
+}
+
 // --- F8 memory-promotion gate: pure candidate->widget mapping (L1-tested) ------
 // The candidates come from `tht memory promote --preview --json` (deterministic,
 // reviewer-approved decisions only); the model never authors them.
@@ -730,10 +741,10 @@ export default function (pi) {
 			const widget = buildMultiselectRequest({
 				id: `u${Date.now()}`,
 				phase,
-				title,
+				title: phase === "F2" ? memorySelectionWidgetProps(opts).title : title,
 				allowEmpty: params.allow_empty ?? false,
 				options: meritOptions,
-				recommended: opts.find((o) => o.recommended)?.id ?? null,
+				...(phase === "F2" ? memorySelectionWidgetProps(opts) : {}),
 			});
 			const resp = await emitAndWait(ctx, widget);
 			if (resp.control === "freetext") {