fix(cloudflare): provide worker env to do methods

[dmmulroy]

Provide WorkerEnvironment when DurableObjectNamespace wraps returned method Effects.

const provideRuntimeServices = (effect) =>
  effect.pipe(
    Effect.provideService(DurableObjectState, doState),
    Effect.provideService(WorkerEnvironment, env),
  );

Adds a regression fixture where a Durable Object method calls KVNamespaceClient directly.

Fixes #368.

Attribution: Pi GPT5.5 on high, guided by Dillon Mulroy dillon@cloudflare.com.