Function memoryAgeDays

src/memdir/memoryAge.ts:6–8

(mtimeMs: number)

 * clamp to 0.
 */
export function memoryAgeDays(mtimeMs: number): number {
  return Math.max(0, Math.floor((Date.now() - mtimeMs) / 86_400_000))
}

/**
 * Human-readable age string.  Models are poor at date arithmetic —