Extend the cross-language vectors with the NATS user nkey derived from the
Ed25519 public key, and a signed control-plane request (CanonicalRequest +
Ed25519 signature). These let the TypeScript busauth port verify it authenticates
on both planes exactly like the Go client (issue uniweb/0001, Phase 1).
Add cmd/busvectors, a generator that emits stable JSON test vectors for the bus
protocol and its E2E crypto (endpoint id, Ed25519 sign, ChaCha20-Poly1305 AEAD
with a fixed nonce, sealed-box of a room key, and canonical Frame wire bytes +
SigningBytes). It uses the same registry crypto (functions/cybersecurity) the
bus uses, so the vectors are the contract the TypeScript port must match
byte-for-byte (issue uniweb/0001, Phase 0).
Regenerate with: go run ./cmd/busvectors > ../uniweb/web/src/bus/testdata/vectors.json
egutierrez