Real sessions DB (~/.hermes/state.db, 444 tui+cli sessions): p50=20,
p75=53, p90=182, p95=340, p99=1941 msgs. The assumed 200-300 'realistic
band' is actually the p90-p95 region; the typical session is ~20 msgs
and the p99 tail reaches ~1940 (real ~2k-msg sessions exist).
New cells at those anchors (2 reps, ink vs otui-capped, 2G scope), VmHWM
medians: 100 msgs 163 vs 222MB; 300 msgs 180 vs 268MB; 2000 msgs 234 vs
671MB (2.9x). session-distribution.mjs regenerates the JSON; run.mjs
gains --configs to skip redundant configs (otui-uncapped == capped below
the 3000-row cap).
