fix: agent class should implement ChatEngine interface (#746)

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

packages/core/e2e/node/openai.e2e.ts

packages/core/e2e/tsconfig.json

packages/core/src/agent/base.ts

packages/core/src/cloud/LlamaCloudIndex.ts

packages/core/src/engines/chat/CondenseQuestionChatEngine.ts

packages/core/src/engines/chat/types.ts

packages/core/src/engines/query/RetrieverQueryEngine.ts

packages/core/src/engines/query/RouterQueryEngine.ts

packages/core/src/engines/query/SubQuestionQueryEngine.ts

packages/core/src/indices/BaseIndex.ts

packages/core/src/indices/keyword/index.ts

packages/core/src/indices/summary/index.ts

packages/core/src/indices/vectorStore/index.ts

packages/core/src/tools/QueryEngineTool.ts

packages/core/src/types.ts

packages/edge/e2e/test-edge-runtime/package.json

packages/experimental/src/engines/query/JSONQueryEngine.ts

pnpm-lock.yaml