feat(cutout): implement boundary padding for cutout textures

- Introduced a new `Boundary Padding` preference in the Cutout Tool with a default of 2 px and a configurable range of 1-4 px.
- Updated the Cutout client to establish inward mapping from the final Mask, sampling in a fixed direction and processing independent material RGBA and Depth.
- Enhanced the handling of RGBA and Depth during cutout operations, ensuring proper mapping and preservation of source data.
- Added tests to validate the new boundary padding functionality and its integration with existing cutout processes.

feat(geometry): remove overall mesh smoothing from geometry nodes

- Removed the `Smooth` input from several geometry node groups to eliminate unnecessary overall mesh smoothing.
- Retained `Smooth Weight` for depth nodes while removing it from Cutout and Relief Plane nodes.
- Ensured that boundary, normal, and fill smoothing behaviors remain intact and consistent.
- Updated tests and documentation to reflect the changes in node interfaces and behaviors.

feat(normals): scale tangent normals with depth

- Reused the existing `o_normal_reduction` attribute to adjust Tangent Normal strength based on the geometry's `Depth Scale`.
- Ensured that Tangent Normal strength is consistent with the geometry depth, preserving full strength for materials that do not provide the attribute.
- Updated tests to verify the correct behavior of normal strength adjustments in both Tangent and Object Space.

openspec/changes/pad-cutout-material-edges/proposal.md

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+## Why
+
+Cutout 的材质和深度在网格轮廓处会线性混合轮廓外的不稳定像素。移动共享 UV 会同时扭曲多个纹理消费者；按最近 donor 搜索又会在复杂轮廓处产生不确定方向，因此需要在 Cutout 客户端按唯一的结构内向统一延伸边界纹理。
+
+## What Changes
+
+- 服务端停止 Cutout 专用深度延伸，只输出未经边缘处理的 MoGe Depth、Metadata 与 Normal；MoGe 输入保持原样。
+- Cutout 客户端从最终 Mask 建立局部结构 inward mapping，以固定方向从轮廓内采样，并同时处理独立材质 RGBA 与 Depth。
+- 材质搬运完整 RGBA；Depth 搬运 camera Z 与 validity，并使用目标像素和原始 intrinsics 重建 camera X/Y。
+- Preferences 的 Cutout Tool 增加 `Boundary Padding`，默认 2 px、范围 1–4 px；同一数值同时表示内部采样距离和外部延伸宽度。
+- 保持源 Image、网格几何、UV、Normal 与原始 Depth Metadata 标定不变。
+
+## Capabilities
+
+### New Capabilities
+
+- `cutout-boundary-padding`: 规定 Cutout 客户端对材质和深度使用同一结构内向映射的边界延伸、设置与数据隔离。
+
+### Modified Capabilities
+
+
+## Impact
+
+- `src/anyimage/operators/cutout_tool` 的最终 Mask、颜色图和深度图处理及对象创建路径。
+- `src/anyimage/operators/cutout_tool` 中的图片缓冲读写与目标射线 Depth 重建。
+- `src/anyimage/preferences.py` 的 Cutout Tool 设置。
+- `src/anyimage/server/jobs/cutout.py` 与 `server/geometry/prediction_artifacts.py` 移除 Cutout 深度延伸启用路径；无节点资产变化。
+- Cutout padding、深度投影、同步/异步路径、Preferences 和资源生命周期测试。