perf: speed up memory batch polling

src/terminal/progress-line.ts

@@ -0,0 +1,17 @@
+let activeStream: NodeJS.WriteStream | null = null;
+
+export function registerActiveProgressLine(stream: NodeJS.WriteStream): void {
+  if (!stream.isTTY) return;
+  activeStream = stream;
+}
+
+export function clearActiveProgressLine(): void {
+  if (!activeStream?.isTTY) return;
+  activeStream.write("\r\x1b[2K");
+}
+
+export function unregisterActiveProgressLine(stream?: NodeJS.WriteStream): void {
+  if (!activeStream) return;
+  if (stream && activeStream !== stream) return;
+  activeStream = null;
+}