Add Mind Break CLI number-guessing game in Python

[victornife]

Motivation

• Provide a small interactive CLI game where a player-defined secret number (3–10 digits) is guessed with feedback on digit positions.
• Support an optional max-attempts limit while allowing unlimited attempts by default.
• Give clear, duplicate-aware feedback about digits in the correct position and digits present but misplaced.

Description

• Added a new script mind_break_cli.py that implements the game loop and user prompts.
• Implemented input validation for the secret number, max attempts, and each guess to ensure numeric-only input and correct lengths.
• Implemented score_guess(secret, guess) to return (correct_position, wrong_position) and handle duplicate digits correctly.
• The CLI reports attempts remaining (or unlimited), per-guess feedback, and ends when the player wins or exhausts attempts.

Testing

• Ran a non-interactive smoke test using redirected stdin: python3 mind_break_cli.py <<'EOF' ... EOF, which exercised game start, scoring feedback, and the win condition, and the run completed as expected.
• No automated unit tests were added in this change.

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Codex Task