Anatomy output emits null width and height on elements

[nathanacurtis]

Problem

The anatomy output includes width: null and height: null on elements. These null values are noise — width and height are not meaningful for anatomy element definitions.

Solution

Exclude width and height properties from anatomy elements when their values are null.

Acceptance criteria

• Anatomy elements do not include width: null or height: null
• Width and height are still included when they have meaningful values

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Implementation details are tracked internally.