upgrade_feature

[stacksjb]

Add new features! yay.

[Copilot]

Pull request overview

This PR expands the CLI menu’s functionality and robustness by adding config-path overrides, CSV export support, stronger config validation, and some refactors that improve testability and menu handling.

Changes:

• Added --config/-c support to load/create a config from a user-supplied path, plus a CLI test for missing path handling.
• Added CSV export support (with roundtrip test coverage) and improved import flow/cancellation handling.
• Introduced validate_config for semantic validation and refactored menu selection parsing (main/edit menus) and command execution (injectable executor for tests).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/assert_cmd.rs	Adds integration coverage for --config requiring a path and returning exit code 2 with a specific stderr message.
src/utils.rs	Introduces an injectable CommandExecutor abstraction and a run_command_with entrypoint to improve testability.
src/menu_main.rs	Refactors main menu selection handling into parsed choices and improves error reporting when command execution fails.
src/menu_edit.rs	Refactors edit menu options into enums, adds CSV export option, and centralizes save/validation flow.
src/main.rs	Moves to async main, adds --config/-c parsing, and awaits the async menu.
src/csv.rs	Adds CSV export and a write_commands_to_csv helper, improves prompt error handling, and adds sorting of discoverable CSV files.
src/config.rs	Adds ensure_config_file_path, atomic-ish config writes via temp+rename, and new validate_config checks with tests.
README.md	Documents the newly supported features (CSV export and alternate config path).

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