Apply hierarchy node transforms relative to parents

coverage/glb-machine-manager/browser-production.report.json

@@ -7,6 +7,7 @@
     "eight GLB parts rendered with studio PMREM lighting and calibrated exposure",
     "dragging GLB root tree nodes updates component parent hierarchy",
     "origin visibility, numeric translation/rotation and TransformControls mode update",
+    "internal mesh parent-relative position and rotation survive GLB export without moving its parent",
     "validated assembly exports a self-contained managed GLB",
     "validated hierarchy applied through LOAD_WORKSPACE with geometry and physical zero in userData",
     "same component assembly switches to BC hierarchy and applies BC geometry",

coverage/glb-machine-manager/browser.report.json

@@ -7,6 +7,7 @@
     "eight GLB parts rendered with studio PMREM lighting and calibrated exposure",
     "dragging GLB root tree nodes updates component parent hierarchy",
     "origin visibility, numeric translation/rotation and TransformControls mode update",
+    "internal mesh parent-relative position and rotation survive GLB export without moving its parent",
     "validated assembly exports a self-contained managed GLB",
     "validated hierarchy applied through LOAD_WORKSPACE with geometry and physical zero in userData",
     "same component assembly switches to BC hierarchy and applies BC geometry",

coverage/glb-machine-manager/mill700/browser.report.json

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     "sha256": "bf37130681cc6462412e52744519516e8ade2a3212dd69153c0b1b3e415bcf66"
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+    "root and internal node transforms update their local position and posture relative to their parent",
     "selected MILL700 joint displays its local XYZ coordinate system at local origin",
     "existing 132-node, depth-6 hierarchy displayed as a draggable tree with node origins",
     "each joint rotates about its own origin while children inherit parent motion",
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