Brummel
3b56efbdb4
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