Instance Context

Instance selection is now Effect-provided context.

Use these APIs:

• InstanceRef for the current project context.
• WorkspaceRef for the current workspace id.
• InstanceState.context / InstanceState.directory inside Effect services that require an instance.
• InstanceStore at entry boundaries that need to load, reload, or dispose project contexts.
• EffectBridge for native, plugin, or plain JavaScript callback boundaries that need to re-enter Effect with captured refs.

Do not add new ambient instance globals. Promise and callback boundaries should either stay in Effect, use EffectBridge, or pass the required context explicitly.