dailz
967c11fea9
load_file previously cleared file_watcher before attempting to open the new file. If open failed, the watcher was lost while loading_state and file_path still pointed to the old file, breaking change detection. Refactor to build-then-swap pattern: all fallible work runs on local variables first, then self is updated only on success. On failure, the old file's watcher, loading_state and file_path remain intact. Update test to verify all three fields are preserved on failure. Closes #32