Add specifications for two-times upscale and unified depth plane features

- Introduced the two-times upscale specification detailing requirements for unified output, fixed model presets, arbitrary dimensions, and consistent job behavior.
- Added scenarios for existing models, repeated upscale, and handling of alpha preservation.
- Created the unified depth plane specification outlining geometry modes, stable interface, and asset evaluation.
- Defined scenarios for mode switching, relief and camera preservation, and validation of delivered assets.

openspec/changes/archive/2026-09-17-pad-cutout-material-edges/tasks.md

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+## 1. Boundary Padding setting
+
+- [x] 1.1 Add the Cutout Tool `Boundary Padding` preference with default 2 px, range 1–4 px and a clamped reader.
+- [x] 1.2 Capture the configured value when each Cutout operation starts so synchronous and asynchronous responses use the same operation value.
+
+## 2. Structural inward mapping
+
+- [x] 2.1 Build a pure array mapping from the final threshold Mask that carries each boundary-band location along one local structural inward direction to the configured internal distance.
+- [x] 2.2 Bound thin-structure rays to their last same-direction internal position and leave undefined directions unchanged without donor thresholds or fallback searches.
+- [x] 2.3 Cover outer outlines, holes, concave corners, thin structures, scaled target resolutions and zero bypass.
+
+## 3. Client-side image processing
+
+- [x] 3.1 Apply the mapping to independent material Color RGBA for synchronous and AI Cutouts while preserving the source Image and AI input.
+- [x] 3.2 Apply the mapping to Depth Z and validity, reconstruct target X/Y from Metadata intrinsics, and preserve reference depth.
+- [x] 3.3 Update and repack processed Color and Depth Images before object consumption while preserving byte, float/HDR and CHANNEL_PACKED interpretation and cleanup.
+
+## 4. Raw server artifacts
+
+- [x] 4.1 Stop enabling server-side depth edge extension for Cutout and remove the unused extension path if no real caller remains.
+- [x] 4.2 Update server tests to require raw MoGe Depth and unchanged Metadata generation.
+
+## 5. Integration and validation
+
+- [x] 5.1 Cover preference capture, synchronous/AI parity, unmodified geometry and UV, correct target-ray Depth projection, Normal isolation, packed ownership and failure cleanup.
+- [x] 5.2 Run related tests, validate OpenSpec strictly, and inspect the final diff and stale references without rebuilding node assets or extension packages.