- 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).
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