Until now nothing outside a live site exercised the NATS side: the
aggregate engine was tested by in-memory replay only. This test
submits an answer, moves it from a desk through the engine, checks
that an undeclared move and an unknown record are refused, and reads
the record back from its own event log. It runs when
PORTAL_TEST_NATS_URL is set; CI starts a throwaway nats:2.14.6-alpine
with JetStream for it and tears it down. Without the variable the
test passes as skipped, so `cargo test` stays green offline.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L4jrCgLiKKHAEFuZUJjckH
