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- domain/changed emission is isolated from the write path: an observer throwing synchronously can no longer turn a committed (durable + in-memory) write into a rejection; the failure is logged and later writes proceed. - Domain lifecycle belongs to the opening consumer: Domain gains an idempotent close() (drain, unit close, reservation release), the facility stops registering effects on its own context and instead closes any still-open domains on unmount; WorkspaceRegistry holds its domain through its own effect, so disposing and re-mounting the consumer no longer wedges on already-open. - defineDomain rejects a global schema accepting null at declaration time: JSON null is the medium's absence sentinel, so a nullable global could never round-trip; failing loud at the spec keeps set(null) unrepresentable. Regression tests cover all three (hostile listener, close/reopen and consumer re-mount, nullable-global rejection).