Chore: Remove legacy Rag engine and Semantic search functionalities from codegraph cli

Author: jruokola

CLEAN_INSTALL.md

@@ -37,7 +37,7 @@ Follow these steps to remove every trace of a previous CodeGraph MCP installatio
 7. **Rebuild your development binary**  
    Inside the repo, rebuild with the required features so the local `target/` tree matches your latest changes:
    ```bash
-   cargo build -p codegraph-mcp --features "ai-enhanced,server-http"
+   cargo build -p codegraph-mcp --features "server-http"
    ```
 
 8. **Start the MCP server with the new binary**  

crates/codegraph-ai/src/lib.rs

@@ -4,8 +4,6 @@ pub mod llm_provider;
 pub mod ml;
 pub mod optimization;
 pub mod qwen_simple;
-pub mod rag;
-pub mod semantic;
 
 // Cloud LLM providers
 #[cfg(feature = "anthropic")]
@@ -19,4 +17,3 @@ pub use agentic_schemas::*;
 pub use llm_factory::LLMProviderFactory;
 pub use llm_provider::*;
 pub use qwen_simple::{QwenClient, QwenConfig, QwenResult};
-pub use semantic::search::*;