Fix test_pin_lock.py to use actual _QuadPackageDef instead of mock

Replaced MockPackageType with actual _QuadPackageDef instances in tests
to fix validation errors with Pydantic discriminated unions.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: robtaylor

tests/test_pin_lock.py

@@ -21,7 +21,7 @@ class MockPackageType:
     """Mock for package type class used in tests"""
     def __init__(self, name="test_package"):
         self.name = name
-        self.type = "_QuadPackageDef"  # This is needed for Pydantic discrimination
+        self.type = "_PGAPackageDef"  # This is needed for Pydantic discrimination
         self.pins = set([str(i) for i in range(1, 100)])  # Create pins 1-99
         self.width = 50  # For Pydantic compatibility
         self.height = 50  # For Pydantic compatibility
@@ -262,7 +262,7 @@ def test_allocate_pins_port(self):
 
     @mock.patch("chipflow_lib.pin_lock._parse_config")
     @mock.patch("chipflow_lib.pin_lock.Config.model_validate")
-    @mock.patch("chipflow_lib.pin_lock.PACKAGE_DEFINITIONS", new={"cf20": MockPackageType(name="cf20")})
+    @mock.patch("chipflow_lib.pin_lock.PACKAGE_DEFINITIONS", new={"cf20": _QuadPackageDef(name="cf20", width=50, height=50)})
     @mock.patch("chipflow_lib.pin_lock.top_interfaces")
     @mock.patch("pathlib.Path.exists")
     @mock.patch("builtins.open", new_callable=mock.mock_open)
@@ -294,7 +294,7 @@ def test_lock_pins_new_file(self, mock_open, mock_exists, mock_top_interfaces,
 
     @mock.patch("chipflow_lib.pin_lock._parse_config") 
     @mock.patch("chipflow_lib.pin_lock.Config.model_validate")
-    @mock.patch("chipflow_lib.pin_lock.PACKAGE_DEFINITIONS", new={"cf20": MockPackageType(name="cf20")})
+    @mock.patch("chipflow_lib.pin_lock.PACKAGE_DEFINITIONS", new={"cf20": _QuadPackageDef(name="cf20", width=50, height=50)})
     @mock.patch("chipflow_lib.pin_lock.top_interfaces")
     @mock.patch("pathlib.Path.exists")
     @mock.patch("pathlib.Path.read_text")