v0.15.1 — docs: withActor (async-safe WHO)
Documents withActor(id, fn) — the async-safe actor wrapper — alongside setActor. In an async handler (Firebase/Cloud Functions, tRPC resolvers) a bare setActor can be lost across an await; withActor (AsyncLocalStorage.run) keeps the user across awaited reads. Docs only — both APIs shipped in 0.14.0.