NATIVE-2026-02: Add disk Use Case CLI Functions

[CodeMelted]

Description: The codemelted.rs module contains the disk_cp, disk_exists, disk_ls, disk_metadata, disk_mkdir, disk_mv, disk_read_file, disk_rm, and disk_write_file functions for the Disk Use Case. Create a cli_disk() function to expose a common way of performing these actions regardless of the terminal / operating system evironiment.

Acceptance Criteria:

1. When the new cli_disk() function is created implementing the identified commands.
2. When the cli_help() function is updated with the availability of the new commands.
3. When the md_book Section 3 is updated with the new commands identifying examples and UML of what of the call sequence.