feat: make workflow execution timeout configurable via env var

.github/workflows/agentex-tutorials-test.yml

@@ -2,7 +2,7 @@ name: Test Tutorial Agents
 
 on:
   pull_request:
-    branches: [main]
+    branches: [main, next]
   push:
     branches: [main]
   workflow_dispatch:

src/agentex/lib/core/temporal/services/temporal_task_service.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from typing import Any
+from datetime import timedelta
 
 from agentex.types.task import Task
 from agentex.types.agent import Agent
@@ -41,6 +42,7 @@ async def submit_task(self, agent: Agent, task: Task, params: dict[str, Any] | N
             ),
             id=task.id,
             task_queue=self._env_vars.WORKFLOW_TASK_QUEUE,
+            execution_timeout=timedelta(seconds=self._env_vars.WORKFLOW_EXECUTION_TIMEOUT_SECONDS),
         )
 
     async def get_state(self, task_id: str) -> WorkflowState:

src/agentex/lib/environment_variables.py

@@ -6,6 +6,7 @@
 from pathlib import Path
 
 from dotenv import load_dotenv
+from pydantic import Field
 
 from agentex.lib.utils.logging import make_logger
 from agentex.lib.utils.model_utils import BaseModel
@@ -32,6 +33,7 @@ class EnvVarKeys(str, Enum):
     # Workflow Configuration
     WORKFLOW_NAME = "WORKFLOW_NAME"
     WORKFLOW_TASK_QUEUE = "WORKFLOW_TASK_QUEUE"
+    WORKFLOW_EXECUTION_TIMEOUT_SECONDS = "WORKFLOW_EXECUTION_TIMEOUT_SECONDS"
     # Temporal Worker Configuration
     HEALTH_CHECK_PORT = "HEALTH_CHECK_PORT"
     # Auth Configuration
@@ -74,6 +76,11 @@ class EnvironmentVariables(BaseModel):
     # Workflow Configuration
     WORKFLOW_TASK_QUEUE: str | None = None
     WORKFLOW_NAME: str | None = None
+    # Maximum total time (in seconds) a workflow execution can run, including
+    # retries and continue-as-new. Defaults to 24h to bound runaway workflows;
+    # agents with longer-running tasks should override this. Must be > 0 — a
+    # zero or negative timedelta would cause every submitted workflow to fail.
+    WORKFLOW_EXECUTION_TIMEOUT_SECONDS: int = Field(default=86400, gt=0)
     # Temporal Worker Configuration
     HEALTH_CHECK_PORT: int = 80
     # Auth Configuration