The visual face pivots from the ledger's egui-native, in-process
zero-copy direction to a web frontend served from disk-persisted
recorder traces: the engine writes recorded traces to disk, a browser
charts them. Settled in an in-context design discussion (provenance in
issue #101): raw per-tap trace persistence + serve-time join_on_ts
alignment + a static self-contained HTML chart (uPlot). The engine
stays headless (C14) — arguably more strictly, since a browser reading
a serialized file is further from the hot path than egui reaching into
the live SoA columns. Amends the C14 visual-face note and the open
"Playground & World UI surface" thread; the C22 realization note lands
when the seam ships.
refs #101
Brummel
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