Bench (realistic fat-turn fixture) put numbers on the cap tradeoff: ~0.65 MB/msg,
~20.4 renderables/msg → 3000 ≈ 2 GB steady RSS, the highest cap within a sane TUI
budget (that ceiling only hit by marathon 3000+-msg sessions; typical cost a
fraction). 1500 was too little scrollback. Tunable via HERMES_TUI_MAX_MESSAGES.
Adds a store `dropped` counter (live overflow in capMessages + the resume slice in
commitSnapshot; reset on clearTranscript) and a dim, selectable=false top-of-
transcript notice — '⤒ N earlier messages — scroll-back capped; full transcript on
the dashboard · session <id>' — so display truncation is visible + points to the
deep-history surface. Display-only: never touches the model's gateway-side context.
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