feat(mcp): update tool descriptions for LLM context optimization

nvim-core/src/lib.rs

@@ -1121,7 +1121,7 @@ pub async fn run_mcp_loop(app_name: &str, app_version: &str) {
                                 },
                                 {
                                     "name": "nvim_send_to_terminal",
-                                    "description": "Send a given command string to a Neovim split terminal.",
+                                    "description": "Send a given command string to a visible Neovim split terminal. Use this instead of running background commands when you need to see ANSI colors or interact with command prompts.",
                                     "inputSchema": {
                                         "type": "object",
                                         "properties": {