fix(perception): reuse M4.8 for vegetation evidence

config/laboratory-value-review.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "missioncore.laboratory-value-review-registry/v1",
-  "reviewed_at_utc": "2026-08-27T20:20:14Z",
+  "reviewed_at_utc": "2026-08-27T20:59:10Z",
   "entries": [
     {
       "catalog_id": "e28-local-surface",
@@ -285,7 +285,7 @@
     {
       "catalog_id": "lab-v1-vegetation-shadow",
       "evidence_id": "lab-v1-vegetation-shadow-ad4d9fbbb21ff8a270b77f559b4e78dcdaf0455afd61afb5033009623984e554",
-      "signal": "progress",
+      "signal": "failed",
       "lifecycle": "current",
       "visual_evidence": "available"
     }

config/perception/lab-v1-goose-vegetation-benchmark-v1.json

@@ -79,6 +79,27 @@
     "hedge",
     "tree_root"
   ],
+  "visual_case_contract": {
+    "selection_basis": "ground-truth-class-support-only",
+    "case_count": 12,
+    "minimum_focus_pixels": 2048,
+    "strata": [
+      { "class_name": "high_grass", "count": 2 },
+      { "class_name": "low_grass", "count": 2 },
+      { "class_name": "bush", "count": 2 },
+      { "class_name": "tree_trunk", "count": 2 },
+      { "class_name": "tree_crown", "count": 1 },
+      { "class_name": "hedge", "count": 1 },
+      { "class_name": "forest", "count": 1 },
+      { "class_name": "crops", "count": 1 }
+    ],
+    "error_overlay": {
+      "correct_material_rgba": [34, 197, 94, 72],
+      "missed_vegetation_rgba": [239, 68, 68, 220],
+      "false_vegetation_rgba": [245, 158, 11, 220],
+      "wrong_vegetation_material_rgba": [168, 85, 247, 220]
+    }
+  },
   "policy_action_colors": {
     "ALLOW": "#22c55e",
     "HIGH_COST": "#f59e0b",