test: replace Chinese docstrings with English in test_job_config_serialization

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: BCeZn

tests/unit/sdk/agent/test_job_config_serialization.py

@@ -14,7 +14,7 @@
 
 
 class TestRockEnvironmentConfigInheritance:
-    """RockEnvironmentConfig 应同时继承 SandboxConfig 和 HarborEnvConfig。"""
+    """RockEnvironmentConfig should inherit from both SandboxConfig and EnvironmentConfig."""
 
     def test_is_sandbox_config_subclass(self):
         from rock.sdk.sandbox.config import SandboxConfig
@@ -54,7 +54,7 @@ def test_harbor_fields_settable(self):
 
 
 class TestToHarborEnvironment:
-    """to_harbor_environment() 应只返回 harbor 原生字段。"""
+    """to_harbor_environment() should return only harbor-native fields."""
 
     def test_returns_harbor_fields_only(self):
         env = RockEnvironmentConfig(force_build=True, override_cpus=4)