✨ feat(builtin): add flat_map and improve builtin functions
- Add flat_map function for mapping and flattening arrays/dicts
- Fix fill function edge case for n=0 and off-by-one error
- Refactor skip_while for improved readability and correctness
- Add comprehensive test suite for all builtin functions
♻️ refactor(cli): Change fmt command to format files in place
Modified the fmt command to accept file paths as arguments and write
formatted output directly to files instead of printing to stdout. This
aligns the formatter behavior with standard code formatters like rustfmt
and prettier.
Changes:
- Add files parameter to fmt command for specifying files to format
- Write formatted output directly to files instead of stdout
- Add file existence validation before formatting
- Update integration tests to reflect new behavior
- Fix duration padding in test module (7 → 8 chars)