Implement arrangement framework for node groups

- Introduced `frames.py` to manage field complex calculations and their arrangement within node groups.
- Added functionality to create and remove field frames based on node arrangements.
- Developed `passages.py` to find unobstructed paths for connections around calculation frames.
- Implemented `references.py` to route shared results on peripheral tracks, ensuring efficient distribution of outputs.
- Created `sections.py` to reserve space for field calculations adjacent to geometry consumers.
- Added `sources.py` to position shared calculation sources effectively beside their distribution channels.
- Enhanced outline smoothing with `outline_smoothing.py` to adapt camera depth along original outlines.

openspec/changes/unify-boundary-depth-smoothing/proposal.md

@@ -7,7 +7,7 @@ Alpha 轮廓和有效性剔除留下的网格边界仍可能采到突变深度
 - 为 `O Image Depth Cutout`、`O Image Depth Plane`、`O Image Depth Panorama` 统一加入置换前的边界深度平滑。
 - 复用 `Boundary Smooth` 控制深度 Blur 与现有边界网格平滑的迭代数，保留默认值 `5`、范围 `0–20`；`0` 完全关闭两者。
 - 在有效性剔除及 Split 后的连通网格上平滑深度标量，仅应用于可处理边界及邻近两圈，并保持各顶点原投影方向。
-- Cutout 的原 Alpha 轮廓参与深度平滑；Depth Plane 保留原矩形外框保护；Panorama 按球面径向距离处理实际网格边界。
+- Cutout 的原 Alpha 轮廓参与分批自适应深度平滑，Outline Depth Fix 控制批次数、Boundary Smooth 控制每批步数，Ratio 固定 0.25–0.5，保护 Split 切边；Depth Plane 保留原矩形外框保护；Panorama 按球面径向距离处理实际网格边界。
 - 复用公共构建函数，补齐行为测试、全景专项验证与节点资产重建。
 
 ## Capabilities