Remove log noise for openai/langchain, add lazy load for langchain and fix Activity return type

[hectorhdzg]

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[Copilot]

Pull request overview

This PR aims to reduce GenAI instrumentation log noise (OpenAI Agents / LangChain), make LangChain tracer loading lazy to avoid optional dependency issues, and align hosting ActivityLike typing for getAgenticInstanceId.

Changes:

• Downgrade “optional dependency missing” initialization/reset logs for OpenAI Agents and LangChain instrumentations from warn to debug.
• Lazy-load the LangChain tracer implementation to avoid eager runtime imports of @langchain/core transitive deps.
• Update ActivityLike.getAgenticInstanceId to allow undefined, and adjust related unit tests.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/genai/instrumentations/langchain/langchainTraceInstrumentor.ts	Switches LangChain tracer import to lazy loading and updates handler injection to accept a tracer constructor.
src/distro/distro.ts	Reduces log severity/noise when optional GenAI packages aren’t installed; adds explanatory comments.
src/a365/hosting/types.ts	Updates ActivityLike.getAgenticInstanceId return type to string | undefined.
test/internal/unit/genai/langchain/langchainTraceInstrumentor.test.ts	Updates tests for the new addTracerToHandlers signature.
test/internal/unit/a365/hosting/outputLoggingMiddleware.test.ts	Adjusts type narrowing in test setup for the updated ActivityLike signature.
test/internal/unit/a365/hosting/baggageMiddleware.test.ts	Adjusts type narrowing in test setup for the updated ActivityLike signature.

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