install page: say when the host has too little swap behind the guest (R-1192 follow-up); restore record log says when a cut restore was put back; unreleased

controller/internal/web/system_memory_handlers.go

@@ -192,3 +192,26 @@ func procMemTotalMB() int64 {
 	}
 	return 0
 }
+
+// hostSwapShort (R-1192 follow-up, night 2026-10-21) asks the agent whether the HOST's swap is below this guest's RAM
+// — the guest swap fix (swap = RAM) puts a memory burst there, and a host with none gets nothing from it. False when
+// it cannot tell (an older agent, an agent that does not answer within 2 s): the install page then shows only the
+// overcommit sentence, as before.
+func (s *Server) hostSwapShort() bool {
+	agent, err := s.memAgentForResize()
+	if err != nil || agent == nil {
+		return false
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	info, err := agent.GuestMemory(ctx)
+	if err != nil {
+		return false
+	}
+	return swapShort(info)
+}
+
+// swapShort: the host's swap is known and below the guest's RAM.
+func swapShort(info agentapi.GuestMemoryInfo) bool {
+	return info.HostSwapMB != nil && info.AllocatedMB > 0 && *info.HostSwapMB < info.AllocatedMB
+}