生成无重叠的 0.2 mm Xynova 笔画图案

在打印页毫米坐标中筛选候选笔画，更新双 UV 产物。38 项测试通过；SVG 检查无交叠。

tests/test_stroke_geometry.py

@@ -0,0 +1,26 @@
+"""Check laser-mark clearance in physical page coordinates."""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "blender" / "scripts"))
+
+from stroke_geometry import has_clearance  # noqa: E402
+
+
+def test_crossing_capsules_are_rejected() -> None:
+    existing = [((-0.2, 0), (0.2, 0), 0.1)]
+    assert not has_clearance(((0, -0.2), (0, 0.2), 0.1), existing, 0.03)
+
+
+def test_near_parallel_capsules_need_edge_spacing() -> None:
+    existing = [((-0.2, 0), (0.2, 0), 0.1)]
+    assert not has_clearance(((-0.2, 0.22), (0.2, 0.22), 0.1), existing, 0.03)
+    assert has_clearance(((-0.2, 0.24), (0.2, 0.24), 0.1), existing, 0.03)
+
+
+def test_disjoint_collinear_capsules_can_clear() -> None:
+    existing = [((0, 0), (0.2, 0), 0.1)]
+    assert has_clearance(((0.45, 0), (0.65, 0), 0.1), existing, 0.03)