Refactor section examples from classes to factory functions

[andreisavu]

Summary

Updated README documentation examples to use factory functions instead of class-based approaches for creating MarkdownSection instances. This simplifies the API and makes the examples more concise and easier to understand.

Changes

• GameRulesSection: Converted from a class inheriting MarkdownSection to a build_game_rules_section() factory function
• HintsSection: Converted from a class inheriting MarkdownSection to a build_hints_section() factory function
• LuckyDiceSection: Converted from a class inheriting MarkdownSection to a build_lucky_dice_section() factory function

Details

All three examples now demonstrate direct instantiation of MarkdownSection[EmptyParams] via factory functions rather than requiring users to create custom subclasses. This approach:

• Reduces boilerplate code in documentation
• Makes it clearer that sections can be created without inheritance
• Maintains all functionality including tool attachment, policies, and visibility settings
• Provides a more straightforward pattern for users to follow in their own code

https://claude.ai/code/session_01EFFbwQAFBquperwEXsAmHd