Patch codeagent_client() to use btw file tools (Path A)

Call this once after loading codeagent to enable btw file tools globally. Modifies .register_all_tools() behaviour for subsequent codeagent_client() calls.

Usage

enable_btw_file_tools()

Details

library(codeagent)
source(system.file("pathA/tools_btw_files.R", package = "codeagent"))
enable_btw_file_tools()   # opt in
client <- codeagent_client(chat)