support Langfuse

[ks6088ts]

What this PR does / why we need it

• support Langfuse

Which issue(s) this PR fixes:

Fixes #177

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

ORGANIZATION=<organization-name>
REPOSITORY=<repository-name>

git clone [email protected]:$ORGANIZATION/$REPOSITORY.git
cd $REPOSITORY

• Test the code

make ci-test

What to Check

Verify that the following are valid

• ...

Additional Information

[Copilot]

Pull Request Overview

This PR adds Langfuse observability support to the template-langgraph project, enabling monitoring and tracing of LangGraph agent interactions.

• Integrates Langfuse CallbackHandler across all agent invocations
• Adds Langfuse as a project dependency
• Updates documentation and environment configuration

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
template_langgraph/services/streamlits/pages/chat_with_tools_agent.py	Adds Langfuse callback handler to Streamlit chat interface
scripts/agent_operator.py	Integrates Langfuse callbacks into CLI agent operations
pyproject.toml	Adds langfuse dependency to project requirements
docs/references.md	Documents Langfuse integration with cookbook reference
Makefile	Updates Trivy security scanner version
.env.template	Adds Langfuse environment variable configuration

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