Update `run()` to take `cancel_flag: Arc<AtomicBool>` that the worker threads will periodically check to see if it is `true`, exiting early (and returning empty results) if so.
codex_file_search
Fast fuzzy file search tool for Codex.
Uses https://crates.io/crates/ignore under the hood (which is what ripgrep uses) to traverse a directory (while honoring .gitignore, etc.) to produce the list of files to search and then uses https://crates.io/crates/nucleo-matcher to fuzzy-match the user supplied PATTERN against the corpus.