Add a ServiceMap.Reference that carries InstanceContext through the
Effect service graph so child fibers retain instance context even when
resumed by external I/O events outside the ALS boundary.
- Add InstanceRef to instance-state.ts; InstanceState.get/has/invalidate
try the Reference first, fall back to ALS
- makeRuntime automatically captures ALS into InstanceRef at the boundary
- provideInstance (test fixture) sets InstanceRef for Effect.runPromiseWith
- Remove all redundant provideInstance(dir) wrappers from prompt tests
- Fix test/lib/effect.ts type params (drop unnecessary S/T generics)
bb039496d5