fix(templates): load the project .env in the Temporal worker before mapping the key

The worker is a separate process and agents run does not load the project
.env into it today, so the LITELLM_API_KEY -> OPENAI_API_KEY mapping ran
against an empty environment. Call load_dotenv() first (as acp.py already
does), so the template works on its own; #515 makes the CLI load .env for
both processes as well.

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

Author: michaelxu2288

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

@@ -1,9 +1,14 @@
 import os
 
-# LiteLLM proxy auth: the worker process runs the model calls, so copy
+# Load the project .env first (the ACP process does the same), then map the
+# LiteLLM proxy key: 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".
+from dotenv import load_dotenv
+
+load_dotenv()  # the project .env, before any project code runs
+
 _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

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

@@ -10,10 +10,15 @@ 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
+# Load the project .env first (the ACP process does the same), then map the
+# LiteLLM proxy key: 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".
+from dotenv import load_dotenv
+
+load_dotenv()  # the project .env, before any project code runs
+
 _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

tests/lib/cli/test_init_templates.py

@@ -151,3 +151,5 @@ def test_temporal_worker_maps_litellm_key(tmp_path: Path, template_type: Templat
     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"
+    assert "load_dotenv()" in src, f"{template_type.value} run_worker.py does not load the project .env"
+    assert src.index("load_dotenv()") < src.index('_litellm_key = os.environ.get("LITELLM_API_KEY")'), "mapping must run after load_dotenv()"