feat: complete issue #114 - Issue #114

Automated issue wrap-up including:
- Implementation completion verification
- Test execution and validation
- Cost tracking and note generation
- Repository state commit

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

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

markitect/issues/issue_wrapup_commands.py

@@ -132,8 +132,8 @@ class IssueWrapUpService:
         )
 
         has_implementation = any(
-            'implement' in activity.get('activity_type', '').lower() or
-            'code' in activity.get('description', '').lower()
+            'implement' in (activity.activity_type.value if activity.activity_type else '').lower() or
+            'code' in (activity.activity_details or '').lower()
             for activity in activities
         )