NATIVE-2026-04: Add runtime Use Case Functions

[CodeMelted]

Description: The codemelted.rs contains the runtime_xxx functions for querying different aspects about the current operating system terminal environment. Create a new cli_runtime to wrap these functions to the codemelted native command.

Acceptance Criteria:

1. When the codemelted command contains the new --runtime-xxx actions.
2. When the cli_help() function explains each of the new actions.
3. When the mdbook section 3 is updated with the new actions with examples and UML of the calling sequence.