CodeGraph CLI MCP Server

# CodeGraph Cache (`codegraph-cache`) ## Overview Implements caching strategies to speed up incremental indexing and queries. ## Features - **Query Cache**: Caches results of expensive graph traversals or vector searches. - **Invalidation**: Logic to invalidate cache entries when files change (hooked into file watchers in the daemon). - **Read-ahead**: Experimental features for pre-fetching related graph nodes.