Add global flag '--help/-h'.

[ernstvonoelsen]

Fixes-71

What

Defines a global --help/-h flag.

Why

Currently, mint h and mint help are implemented to show the help info. When using mint -h or mint --help, the help message is only shown due to the fact that --help is actually not supported, and this is highlighted by a FATAL error message.

How Tested

• built and run locally
• added a unittest to ensure that --help/-h behaves in the same error-free manner as --verbose/-v.

[augmentcode]

🤖 Augment PR Summary

Summary: Adds a global --help/-h flag so mint --help works cleanly even with the custom help command.
Changes: Introduces the global help flag in master CLI flags and adds a small CLI smoke test covering version/help invocations.

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[augmentcode]

Review completed. 1 suggestions posted.

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[augmentcode]

This test covers -h but not --help, which is the primary behavior change described in the PR. Also, -v is the built-in alias for --version in urfave/cli, so it doesn’t validate --verbose behavior.

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