fix: Add missing semaphore_limit attribute to GraphitiService

The GraphitiService.__init__ was accepting semaphore_limit as a parameter but not storing it as an instance attribute, causing an AttributeError when trying to access self.semaphore_limit in the initialize method.

🤖 Generated with Claude Code

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

mcp_server/src/graphiti_mcp_server.py

@@ -110,6 +110,7 @@ class GraphitiService:
 
     def __init__(self, config: GraphitiConfig, semaphore_limit: int = 10):
         self.config = config
+        self.semaphore_limit = semaphore_limit
         self.semaphore = asyncio.Semaphore(semaphore_limit)
         self.client: Graphiti | None = None
         self.entity_types = None