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fix(world): mesh_svg 线稿缺省色改取最暗材质色（lingshu bounty #1961，#1122 修法重提） - #1160
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STYLE["outline_color"]=None 的契约是「该物体最暗材质色再压暗 0.42」——旧 实现取 mesh.faces[0]，同一几何仅因 OBJ 里面块顺序不同就换线稿色，破坏「同 样场景两次导出逐字节相同」的确定性。修法：_darkest_face_color 按去重材质 色集合的 Rec.709 亮度取最暗（同亮度按 RGB 分量序定序，与面序无关），空网格 回落 default。净增量镜像自 PR #1122（zhtty67-rgb 修法与守卫原样）。 守卫 7 条（基线 4 红/3 绿）；mesh_svg 指纹重登记 strict 64/64。
This was referenced Oct 30, 2026
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Summary
#1961 修法重提：PR #1122 的修法（mesh_svg 线稿缺省色改取最暗材质色）因维护侧处置时序（#1155 只合了 structure 面）未随之落地——本 PR 从该分支原样重提（内容逐字同 #1122 已审版本，守卫 7 条）。
STYLE["outline_color"]=None契约：该物体最暗材质色再压暗 0.42——旧实现取mesh.faces[0]，同一几何仅因 OBJ 里面块顺序不同就换线稿色，破坏「同样场景两次导出逐字节相同」的确定性。_darkest_face_color按去重材质色集合的 Rec.709 亮度取最暗（同亮度按 RGB 分量序定序，与面序无关），空网格回落 default。Tests
tests/test_bounty1961_mesh_svg_outline_darkest.py（7 条，fix: mesh_svg 线稿缺省色改取最暗材质色而非 faces[0]（Fixes #1961） #1122 原样）——7 passed；基线（main）4 红/3 绿 ⇒ 鉴别力（已实证）。