fix(accessor): correct v1.2.1 entry point return type

Fix get_entry_point() method in PackageAccessorV1_2_1 to return
the full entry_point dict instead of just the mcp_server value.

Root cause: Method was returning metadata.get('entry_point').get('mcp_server')
which only returned the string value, but callers expected the full dict
with both mcp_server and hatch_mcp_server keys.

Solution: Return metadata.get('entry_point', {}) to provide full dict.
Update get_mcp_entry_point() to extract mcp_server value from the dict.

This fixes test failures in test_package_service.py where entry_point
was expected to be a dict but received a string.

Author: LittleCoinCoin

hatch_validator/package/v1_2_1/accessor.py

@@ -30,26 +30,31 @@ def can_handle(self, schema_version: str) -> bool:
         return schema_version == "1.2.1"
 
     def get_entry_point(self, metadata):
-        """From v1.2.1, returns the same as get_mcp_entry_point().
+        """Get the full entry point dict for v1.2.1.
+
+        In v1.2.1, entry_point is a dict with mcp_server and hatch_mcp_server keys.
+        This method returns the full dict to maintain backward compatibility with
+        code that expects to access both entry points.
 
         Args:
             metadata (dict): Package metadata
 
         Returns:
-            Any: Dual entry point value
+            dict: Dual entry point dict with mcp_server and hatch_mcp_server keys
         """
-        return metadata.get('entry_point').get('mcp_server')
-    
+        return metadata.get('entry_point', {})
+
     def get_mcp_entry_point(self, metadata):
         """Get MCP entry point from metadata.
 
         Args:
             metadata (dict): Package metadata
 
         Returns:
-            Any: MCP entry point value
+            str: MCP entry point value (e.g., "mcp_server.py")
         """
-        return self.get_entry_point(metadata)
+        entry_point = metadata.get('entry_point', {})
+        return entry_point.get('mcp_server') if isinstance(entry_point, dict) else None
 
     def get_hatch_mcp_entry_point(self, metadata):
         """Get Hatch MCP entry point from metadata.