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Refactor BlizzardScene for safety and maintainability#3

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gradigit wants to merge 2 commits intomainfrom
refactor-blizzard-scene-16307089611453078204
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Refactor BlizzardScene for safety and maintainability#3
gradigit wants to merge 2 commits intomainfrom
refactor-blizzard-scene-16307089611453078204

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@gradigit gradigit commented Feb 9, 2026

This PR refactors BlizzardScene.swift to improve code safety and maintainability by removing implicitly unwrapped optionals and extracting magic numbers. It also adds unit tests for BlizzardScene and improves documentation in BlizzardCoordinator.swift. Tests were verified by code inspection as the Swift toolchain is not available in the environment.


PR created automatically by Jules for task 16307089611453078204 started by @gradigit

…agic numbers.

- Initialize `heightMap`, `pileNode`, `glowNode`, and `repulsionField` in `init(size:)` instead of `didMove(to:)` to make them non-optional.
- Extract magic numbers to a private `Constants` enum.
- Add `BlizzardSceneTests.swift` to verify scene initialization and update loop.
- Add comments to `BlizzardCoordinator.swift` explaining escalation logic.

Co-authored-by: gradigit <253359007+gradigit@users.noreply.github.com>
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- Change `XCTAssertEqual(scene.backgroundColor, .clear)` to `XCTAssertEqual(scene.backgroundColor.alphaComponent, 0.0)` to handle color space differences (NSDeviceRGB vs Generic Gray).

Co-authored-by: gradigit <253359007+gradigit@users.noreply.github.com>
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