🎨 Palette: Add ARIA attributes to score display

[EiJackGH]

💡 What: Added aria-live="polite" and aria-atomic="true" attributes to the score display in src/views/mario-game.njk. Removed the broken venv entry from requirements.txt.
🎯 Why: To ensure screen readers dynamically announce the score as it updates during the game, significantly improving accessibility for visually impaired users. Additionally, fixed a dependency bug where venv was incorrectly listed, failing the installation process for testing tools.
📸 Before/After: The visual representation of the game remains perfectly intact, which is the intended outcome for ARIA attributes. A verification screenshot is attached via the automated pre-commit UI verification step.
♿ Accessibility: Screen readers will now automatically announce dynamic changes to the score element, reducing friction for users relying on assistive technologies.

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PR created automatically by Jules for task 10671653022068643874 started by @EiJackGH

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