Remove unused is_update_operation and is_create_operation functions from tools.rs

Agent-Logs-Url: https://github.com/github/gh-aw-mcpg/sessions/5e165951-7335-4f8b-90ce-b565a68fb3ff

Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

Author: Copilot

guards/github-guard/rust-guard/src/tools.rs

@@ -89,16 +89,6 @@ pub fn is_delete_operation(tool_name: &str) -> bool {
     tool_name.starts_with("delete_")
 }
 
-/// Check if a tool is an update operation
-pub fn is_update_operation(tool_name: &str) -> bool {
-    tool_name.starts_with("update_")
-}
-
-/// Check if a tool is a create operation
-pub fn is_create_operation(tool_name: &str) -> bool {
-    tool_name.starts_with("create_")
-}
-
 /// Check if a tool is a lock operation
 pub fn is_lock_operation(tool_name: &str) -> bool {
     tool_name.starts_with("lock_")