Function memoryFreshnessNote

src/memdir/memoryAge.ts:49–53

(mtimeMs: number)

 * don't add their own system-reminder wrapper (e.g. FileReadTool output).
 */
export function memoryFreshnessNote(mtimeMs: number): string {
  const text = memoryFreshnessText(mtimeMs)
  if (!text) return ''
  return `<system-reminder>${text}</system-reminder>\n`
}