Add Bus.Service as a ServiceMap.Service backed by Effect PubSub:
- publish() pushes to per-type + wildcard PubSubs and GlobalBus
- subscribe() returns a typed Stream via Stream.fromPubSub
- subscribeAll() returns a wildcard Stream
Legacy adapters wrap the Effect service:
- publish → runPromiseInstance
- subscribe/subscribeAll → runCallbackInstance with Stream.runForEach
Other changes:
- Register Bus.Service in Instances LayerMap
- Add runCallbackInstance helper to effect/runtime
- Remove unused Bus.once (zero callers)
- Skip PubSub creation on publish when no subscribers exist
- Move subscribe/unsubscribe logging into the Effect service layer
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