Add test framework models

src/py_dvt_ate/framework/__init__.py

@@ -3,3 +3,7 @@
 Provides test sequencing, measurement logging, limit checking,
 and runtime context management for DVT characterisation tests.
 """
+
+from py_dvt_ate.framework.context import ITest, TestContext
+
+__all__ = ["ITest", "TestContext"]