Add Python bindings and observation API for Rusty Runways

[DennisLent]

Summary

• add new rusty_runways_py crate exposing PyGame and PyVectorEnv Python classes
• expose Game::execute_str, step, observe, and logging for agent integrations
• support deterministic state serialization and Python tests
• run Python tests in CI, upload Python coverage to Codecov, and verify pip install across platforms

Testing

• cargo clippy --all-targets -- -D warnings
• cargo test --all
• python -m pytest crates/py/tests

---

https://chatgpt.com/codex/tasks/task_e_689b50a067808320a126b8df5e4fe8f5

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (753be28) to head (57c2de8).

Additional details and impacted files

@@             Coverage Diff              @@
##             main       #30       +/-   ##
============================================
+ Coverage   36.02%   100.00%   +63.97%     
============================================
  Files          21         1       -20     
  Lines        1413        32     -1381     
============================================
- Hits          509        32      -477     
+ Misses        904         0      -904     

Flag	Coverage Δ
python	100.00% <100.00%> (?)
rust	?

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