[DOCS] Improve CLI help text for clarity and completeness

[RainRat]

This PR improves the internal help strings of the evolverstage.py script. The primary changes involve overhauling the module docstring (which serves as the CLI --help text) to be more user-friendly, consistent, and comprehensive.

Key improvements:

• Simplified Language: Replaced technical jargon with Plain English (e.g., "win streaks" instead of "log history").
• Improved Structure: Reorganized commands into logical groups (General, Evolution, Battle Tools, Utilities) and adopted a clean [COMMAND] [OPTIONS] usage format.
• Added Missing Options: Documented the -o/--output option for the --normalize command, which was previously missing from the help text.
• Consistency: Ensured all commands and options are presented consistently, with clear explanations of default behaviors and common flags like --arena and --json.
• Clarity: Added explicit examples for common tasks to help new users get started quickly.

These changes ensure the tool is more accessible to both developers and casual users, following the project's documentation guidelines.

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PR created automatically by Jules for task 16631117226235601656 started by @RainRat

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