Improve GLB manager lighting for metallic models

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

@@ -0,0 +1,23 @@
+{
+  "schema": "machine-manager-mill700-browser.v1",
+  "report_id": "GLB-MGR-E05",
+  "status": "verified",
+  "model": {
+    "path": "/home/mes006/linuxcncWebWASM/MILL700-U_1.glb",
+    "bytes": 9418852,
+    "sha256": "bf37130681cc6462412e52744519516e8ade2a3212dd69153c0b1b3e415bcf66"
+  },
+  "checks": [
+    "existing 132-node, depth-6 hierarchy preserved",
+    "metallic MILL700 surfaces rendered with studio PMREM lighting; screenshot captured for visual review"
+  ],
+  "hierarchy": {
+    "root": "MILL700-U_1",
+    "nodes": 132,
+    "meshes": 126,
+    "maxDepth": 6,
+    "materials": 126,
+    "metallic": 110
+  },
+  "browser_errors": []
+}