Golden vectors generated by unibus cmd/busvectors: the contract the TypeScript
bus SDK must match byte-for-byte (Ed25519 sign, ChaCha20-Poly1305 AEAD, sealed
box, Frame wire format). Issue 0001, Phase 0.
Extracted from unibus v0.13.0: the chat SPA (web/, React+Mantine, per-user
BIP39 wallet) and the web gateway (cmd/webgw, REST+SSE) that acts as a bus
peer for the browser. Consumes unibus as a Go module via replace => ../unibus,
keeping its own replace fn-registry for the cybersecurity primitives.
go build/vet/test and pnpm build green in the new location.