feat: Add LangSmith integration metadata to createAgent and initChatModel

[Tanushree (tanushree-sharma)]

Adds ls_integration metadata to agents created via createAgent and initChatModel, enabling identification of langchain traces in LangSmith. createAgent gets ls_integration": "langchain_create_agent" and initChatModel gets "langchain_chat_model" added

createAgent

initChatModel

[changeset-bot]

🦋 Changeset detected

Latest commit: 7af0b65

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 19 packages

Name	Type
@langchain/core	Patch
langchain	Patch
@langchain/classic	Patch
@langchain/cohere	Patch
@langchain/community	Patch
@langchain/anthropic	Patch
@langchain/deepseek	Patch
@langchain/google-cloud-sql-pg	Patch
@langchain/google-common	Patch
@langchain/google-genai	Patch
@langchain/google-webauth	Patch
@langchain/openai	Patch
@langchain/openrouter	Patch
@langchain/xai	Patch
@langchain/model-profiles	Patch
@langchain/standard-tests	Patch
@langchain/google-gauth	Patch
@langchain/google-vertexai-web	Patch
@langchain/google-vertexai	Patch

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