{"service":"GripForge","endpoint":"POST /api/v1/attach","backend":"cli","fields":{"character":"file glb/gltf","prop":"file glb/gltf","style":"melee|gun|shield|staff (optional)","hand":"right|left (optional)","ratio":"number heightRatio override (optional)","fingers":"1 to synthesise finger bones on a wrist-only rig (optional)","fist":"fist closing amount 0..1, default 1 (optional)"}}