fix(templates): map LITELLM_API_KEY to OPENAI_API_KEY in Temporal workers

The temporal-openai-agents and temporal-pydantic-ai templates' .env.example
only set LITELLM_API_KEY. The OpenAI Agents template's acp.py copies it into
OPENAI_API_KEY, the Pydantic AI template never does, and in both the model
call runs in the Temporal worker, a separate process started by
agentex agents run, which never got the mapping. Following either template's
own instructions fails in the worker with openai.OpenAIError: Missing
credentials after the activity's retries, while the ACP process looks
healthy. (temporal-langgraph is fine: graph.py, imported by the worker,
already does the mapping.)

Apply the same three-line mapping in both run_worker.py templates and add a
parametrized test asserting the worker entrypoints carry it.

Reproduced and verified on scaffolded agents against a local backend with
only LITELLM_API_KEY set: before, no reply and Missing credentials in the
worker log; after, the turn completes (gpt-5-nano).

Claude-Session: https://claude.ai/code/session_01HCVKnA7LeJZ44nxZz1uzF3

Author: michaelxu2288

src/agentex/lib/cli/templates/temporal-openai-agents/project/run_worker.py.j2

@@ -1,3 +1,13 @@
+import os
+
+# LiteLLM proxy auth: the worker process runs the model calls, so copy
+# LITELLM_API_KEY to OPENAI_API_KEY before importing project code (some
+# frameworks build their OpenAI client at import time). Without this the
+# worker raises "Missing credentials".
+_litellm_key = os.environ.get("LITELLM_API_KEY")
+if _litellm_key and not os.environ.get("OPENAI_API_KEY"):
+    os.environ["OPENAI_API_KEY"] = _litellm_key
+
 import asyncio
 
 from agentex.lib.core.temporal.activities import get_all_activities
@@ -15,6 +25,7 @@ from agentex.lib.core.temporal.plugins.openai_agents.models.temporal_streaming_m
 from project.workflow import {{ workflow_class }}
 from project.activities import get_weather
 
+
 environment_variables = EnvironmentVariables.refresh()
 
 logger = make_logger(__name__)

src/agentex/lib/cli/templates/temporal-pydantic-ai/project/run_worker.py.j2

@@ -8,6 +8,17 @@ class and registers every model/tool activity the TemporalAgent needs —
 so we don't have to enumerate activities by hand here.
 """
 
+import os
+
+# LiteLLM proxy auth: the worker process runs the model calls, so copy
+# LITELLM_API_KEY to OPENAI_API_KEY before importing project code (some
+# frameworks build their OpenAI client at import time). Without this the
+# worker raises "Missing credentials".
+_litellm_key = os.environ.get("LITELLM_API_KEY")
+if _litellm_key and not os.environ.get("OPENAI_API_KEY"):
+    os.environ["OPENAI_API_KEY"] = _litellm_key
+
+
 import asyncio
 
 from project.workflow import {{ workflow_class }}
@@ -19,6 +30,7 @@ from agentex.lib.environment_variables import EnvironmentVariables
 from agentex.lib.core.temporal.activities import get_all_activities
 from agentex.lib.core.temporal.workers.worker import AgentexWorker
 
+
 environment_variables = EnvironmentVariables.refresh()
 logger = make_logger(__name__)
 

tests/lib/cli/test_init_templates.py

@@ -137,3 +137,17 @@ def test_requirements_include_langgraph_plugin_and_temporal(self, tmp_path: Path
         requirements = (project_dir / "requirements.txt").read_text()
         assert "temporalio[langgraph]>=1.27.0" in requirements
         assert "langchain-openai" in requirements
+
+
+@pytest.mark.parametrize("template_type", [TemplateType.TEMPORAL_OPENAI_AGENTS, TemplateType.TEMPORAL_PYDANTIC_AI])
+def test_temporal_worker_maps_litellm_key(tmp_path: Path, template_type: TemplateType):
+    """Temporal workers that call OpenAI-compatible models must see OPENAI_API_KEY.
+
+    These templates' .env.example only set LITELLM_API_KEY. The model call runs
+    in the worker process, started separately from the ACP process, so the
+    worker entrypoint needs the LITELLM_API_KEY -> OPENAI_API_KEY mapping or it
+    fails with "Missing credentials".
+    """
+    project_dir = _render_project(tmp_path, template_type)
+    src = (project_dir / "project" / "run_worker.py").read_text()
+    assert 'os.environ["OPENAI_API_KEY"] = _litellm_key' in src, f"{template_type.value} run_worker.py lacks the LITELLM_API_KEY mapping"