Initial MoonModel implementation

config/example_box.yml

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+printer:
+  name: Bambu Lab X2D
+  tooling: both_nozzles
+  build_volume_mm: [235.5, 256.0, 256.0]
+nozzle_mm: 0.4
+edge_clearance_mm: 2.0
+purpose: box
+assembly: eight_piece
+size: {input: diameter, value: 160, unit: mm, meaning: final_envelope}
+vertical_exaggeration: 5
+palette:
+  - {name: Mare charcoal, hex: "#303238"}
+  - {name: Highland silver, hex: "#CBC9BF"}
+grid:
+  enabled: true
+  interval_degrees: 30
+  line_width_mm: 1.2
+  color_name: Highland silver
+magnets: {diameter_mm: 6, thickness_mm: 3, count: 8}
+stand: {enabled: true, style: orbital_triskelion, base_clearance_mm: 10.0, material: null}
+resolution: {longitude_segments: 360}
+output: {name: example_magnetic_box}