Create CLI Interface Module

[Mkalbani]

Description

Build a cli module that provides the terminal-based user interface for the game, wrapping all other modules.

Acceptance Criteria

• A cli module exists under src/cli/mod.rs
• Renders puzzle descriptions, hints, and score to stdout
• Accepts and routes player input to the input module
• Displays reward and achievement notifications on unlock
• Integration tests simulate a full puzzle session via CLI