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* Record the messenger between two nodes and its latency (089)eunhhu2026-09-272-0/+128
The roadmap's E2EE messenger made of the runtime's general parts, with no messenger code in it: sealed, authenticated sessions between nodes (086, 088), Vega on each node's display as a surface (design 010), the app in Vega's examples. Vega's check runs two nodes through a recording relay: a line typed on one display is drawn on the other, frames match the vega command's, and the relay sees no text. A line takes 0.79 ms at p50 and 1.1 ms at p99 from one node's program to the other node's views with stores in RAM, both commits, the HTTP delivery and the seal included (sealing adds nothing measurable); on the Pi's SD card 3.5 ms at p50, the long tail being the card's syncs.