Add Z to fidget::raster::pixel::RenderConfig

[mkeeter]

Fixes #444

[Copilot]

Pull request overview

This PR extends the 2D pixel rasterizer configuration to support rendering a slice at an arbitrary Z value (instead of always evaluating at Z=0), aligning with Issue #444.

Changes:

• Add z: f32 to fidget::raster::pixel::RenderConfig with a default of 0.0.
• Thread the configured Z value through interval- and bulk-evaluation paths (Worker scratch buffers and interval bounds).
• Add a unit test validating inside/outside behavior across different Z values, and update the changelog.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
fidget-raster/src/pixel.rs	Adds RenderConfig.z, propagates Z into evaluation, and adds a test for Z-dependent rendering.
CHANGELOG.md	Documents the new RenderConfig.z API surface.

Suppressed comments (2)

fidget-raster/src/pixel.rs:555

• RenderConfig::run returns Image (not Option/Result), so calling .unwrap() here won’t compile. Remove the unwrap and terminate the method chain with a semicolon.

        }
        .run(shape.clone().try_into().expect("no vars"))

fidget-raster/src/pixel.rs:565

• RenderConfig::run returns Image (not Option/Result), so calling .unwrap() here won’t compile. Remove the unwrap and terminate the method chain with a semicolon.

        }
        .run(shape.try_into().expect("no vars"))

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