Work with the store

SurrealDB holds every table. dev up writes its whole connection contract into .devx/env, and nothing defaults: a process that is not configured fails loudly instead of quietly connecting to the wrong store.

• Connection: NAVIGATOR_SURREAL_ENDPOINT, _NAMESPACE, _DATABASE.
• Schema: one idempotent DEFINE file, applied whole on every boot.
• Tests: an embedded engine per test — no container, no port, nothing to reclaim.