The host fold derives whole-session timing totals from the durable
step/tool lifecycle (step/start -> assistant/message -> step/end;
tool/call -> tool/result by callId): step wall time, the model-call
slice, and per-call tool durations with a bounded per-name tally
(stateVersion 11; cached rows refold from the log).
The head row becomes four equal cards: an eight-cell context grid
(shape stats, event tally, cost estimate with its rate tooltip), a
token ring around the cache-hit share, and a timing ring splitting
model calls vs tool runs. Legend rows pair each donut slice with
its label, quantity, and share - no bars; the ring center type
scales with the ring so it never touches the stroke. Wire guards,
i18n, styles, and hostile-input test fixtures included.
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