Drop Python 3.8 support and modernize type hints

[shenanigansd]

This PR modernizes the codebase by removing support for Python 3.8 and leveraging features available in Python 3.9+.

Summary

Removes from __future__ import annotations statements across the codebase and updates enum usage to use StrEnum instead of Enum, which are now available as standard library features in Python 3.9+.

Key Changes

• Removed from __future__ import annotations from 11 files (no longer needed in Python 3.9+)
• Changed CardType from Enum to StrEnum for cleaner string-based enum handling
• Updated ACTION_TYPES type annotation from dict[str, type[PlayCard | CastInstant | PassPriority]] to the more maintainable dict[str, type[Action]]

Implementation Details

The removal of from __future__ import annotations is safe because:

• PEP 563 (postponed evaluation of annotations) is now the default behavior in Python 3.10+
• For Python 3.9, the codebase doesn't rely on forward references that would require the future import
• This simplifies imports and reduces boilerplate

The switch to StrEnum provides better type safety for string-based enums and is more idiomatic for Python 3.11+.

https://claude.ai/code/session_01Sntsy7nFtkxGJAHMVZAwGf

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (02cd5fa) to head (8f56a6d).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #31   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          521       496   -25     
  Branches        26        26           
=========================================
- Hits           521       496   -25     

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