feat: adopt uipath-llm-client 1.18.0 coded-playground agenthub_config default

[al3xanndru]

What

Adopts the uipath-llm-client 1.18.0 behavior so coded LangGraph agents meter design-time LLM calls as CodedAgents.Playground:

• Bumps uipath-llm-client and all uipath-langchain-client[...] extras from >=1.17.1,<1.18.0 to >=1.18.0,<1.19.0.
• Bumps uipath-langchain 0.15.3 → 0.15.4.
• Updates tests/chat/test_agenthub_config_default.py to the new default contract.

With 1.18.0, directly-constructed clients (UiPathChatAnthropicBedrock, etc.) default client_settings.agenthub_config to codedagentsplayground at design time (local / Studio Web / debug) and to None when deployed (→ AgentHub.LLM). Coded user code constructs these clients directly, so this is what actually makes a coded agent send the header.

Test changes

test_default_is_none (asserted the old None default) is replaced by context-aware cases, parametrized over all eight client classes:

Test	Context	Expect
test_default_is_coded_playground_at_design_time	no job key	agenthub_config == "codedagentsplayground"
test_default_is_none_when_deployed	UIPATH_JOB_KEY set	None
test_coded_playground_header_on_inner_http_client_at_design_time	design-time	header = codedagentsplayground
test_no_agenthub_header_on_inner_http_client_when_deployed	deployed	header omitted
test_env_var_is_honored / ..._on_inner_http_client	explicit env	env value wins

⚠️ Stacked on an unpublished dependency

This is blocked on uipath-llm-client-python #125, which introduces and publishes 1.18.0. Until that merges and publishes to PyPI, uv sync cannot resolve the bumped pins, so CI will be red and I could not run the suite locally. The reviewer can validate early against a build:dev TestPyPI build of 1.18.0 via the repo's custom-version test workflow. Merge order: #125 first, then this.

Related

• Client default: uipath-llm-client-python Default Agent Code is not working in Client Environment #125
• Server FF gate: AgentHubService #1618
• Consumption formula (alpha): gitops #551167

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates uipath-langchain to align with uipath-llm-client 1.18.0’s new default behavior for client_settings.agenthub_config, so directly-constructed (coded) LangGraph agents meter design-time LLM calls under CodedAgents.Playground by default while keeping deployed execution unmetered via that header.

Changes:

• Bump uipath-langchain version to 0.15.4 and update uipath-llm-client / uipath-langchain-client[...] dependency ranges to >=1.18.0,<1.19.0.
• Update tests/chat/test_agenthub_config_default.py to assert context-aware defaults (design-time vs deployed) and to verify header emission/omission accordingly.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/chat/test_agenthub_config_default.py	Updates assertions to match 1.18.0’s context-sensitive agenthub_config default and corresponding header behavior.
pyproject.toml	Bumps package version and pins uipath-llm-client / uipath-langchain-client[...] ranges to the 1.18.x line.

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