[denyrt]

Summary

Introduce game record persistence with support for exporting, serializing, and restoring games.

Game records

• Add immutable game record export.
• Support restoring games from validated records.
• Introduce versioned JSON serialization for game records.

Engine improvements

• Reduce game state allocations to improve performance.
• Refactor engine internals for better readability and maintainability.

Project maintenance

• Update the SDK to the next version.
• Update the package version and add a package icon.
• Update CI actions to use Node.js 24 and eliminate duplicate workflow runs triggered by both push and pull_request.

Related issues

None.

Validation

• CI checks passes successfully

Compatibility and risks

• Serialization: Review version compatibility and handling of unsupported or malformed game records.
• Game restoration: Ensure restored games preserve the expected state and reject invalid records.
• Performance: Verify that allocation optimizations preserve existing engine behavior.
• Packaging: Verify SDK compatibility and package metadata after the version update.

Visual changes

No application UI changes. Added a package icon.

Checklist

• The change is focused on one logical purpose.
• Tests were added or updated when behavior changed.
• Documentation was updated when required.
• Relevant local validation passed, or limitations are explained above.
• No credentials, personal data, or unintended generated files are included.