=== Task 1 deep dive: does VmHWM scale with window length? ===
(the docs promise it does NOT — O(one chunk) residency)

baseline VmHWM = 4 MiB

1 month          records=24466     aura-resident<=1024? true  | VmHWM=6 MiB
6 months         records=159156    aura-resident<=1024? true  | VmHWM=15 MiB
1 year           records=305878    aura-resident<=1024? true  | VmHWM=24 MiB
4 years          records=1295897   aura-resident<=1024? true  | VmHWM=78 MiB
~10 years        records=3064025   aura-resident<=1024? true  | VmHWM=173 MiB
