refactor: full typed & iterator of agent worker/runner (part 3) (#728)

.npmrc

apps/docs/docs/examples/agent.mdx

apps/docs/docs/modules/agent/index.md

apps/docs/docs/modules/agent/multi_document_agent.mdx

apps/docs/docs/modules/agent/openai.mdx

apps/docs/docs/modules/agent/query_engine_tool.mdx

apps/docs/docs/modules/agent/react_agent.mdx

examples/agent/multi_document_agent.ts

examples/agent/openai.ts

examples/agent/react_agent.ts

examples/agent/step_wise_openai.ts

examples/agent/step_wise_query_tool.ts

examples/agent/step_wise_react.ts

examples/package.json

examples/readers/package.json

examples/recipes/cost-analysis.ts

examples/tsconfig.json

packages/core/.gitignore

packages/core/e2e/fixtures/llm/open_ai.ts

packages/core/e2e/node/claude.e2e.ts