fix: agent streaming final message & async local storage (#1456)

.changeset/early-snakes-matter.md

apps/next/src/content/docs/llamaindex/setup/typescript.mdx

e2e/node/issue.e2e.ts

e2e/node/snapshot/#1281.snap

e2e/tsconfig.json

packages/cloud/tsconfig.json

packages/core/package.json

packages/core/src/agent/base.ts

packages/core/src/agent/utils.ts

packages/core/tsconfig.json

packages/env/package.json

packages/env/src/als/index.node.ts

packages/env/src/als/index.non-node.ts

packages/env/src/als/index.web.ts

packages/env/src/index.browser.ts

packages/env/src/index.edge-light.ts

packages/env/src/index.ts

packages/env/src/index.workerd.ts

packages/env/src/node-polyfill.ts

packages/env/src/utils/index.ts