PBR-Render: A PBR 3D Model Preview Plugin for DeepSeek Harness

pbr-render is a PBR 3D model preview plugin for DeepSeek Harness (DSH), designed to address the lack of intuitive visual feedback when agents handle game art assets. The plugin supports rendering GLB/GLTF models as interactive 3D previews, embedded in responses via the `pbr3d` fence. Key features include full PBR rendering, multiple material channel inspection modes (e.g., normal, roughness, metalness, etc.), five built-in environment lighting presets for switching, and interactive operations such as drag-to-rotate and zoom. The plugin also incorporates an active trigger mechanism and safety boundary protection, exposing only files with specific extensions within the workspace and limiting size to 512 MiB. Installation is performed via GitHub commands or local paths, requiring a restart of `dsh web` to take effect. The plugin is applicable for use with D