Add SEMAPHORE_LIMIT logging to startup configuration

Log the SEMAPHORE_LIMIT value at startup to help users verify their
concurrency control settings are being applied correctly. This is
especially useful when troubleshooting rate limit issues.

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

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

mcp_server/src/graphiti_mcp_server.py

@@ -1541,6 +1541,7 @@ async def initialize_server() -> ServerConfig:
     logger.info(f'  - Database: {config.database.provider}')
     logger.info(f'  - Group ID: {config.graphiti.group_id}')
     logger.info(f'  - Transport: {config.server.transport}')
+    logger.info(f'  - Semaphore Limit: {SEMAPHORE_LIMIT}')
 
     # Log graphiti-core version
     try: