Exclude derived scene thumbnails from orphan findings

scripts/core/finding-engine.js

@@ -211,6 +211,7 @@ function wildcardToRegExp(pattern) {
 }
 
 function shouldReportOrphan(file, references) {
+  if (isDerivedSceneThumbnail(file)) return false;
   if (file.riskClass === "stable-world") {
     const worldId = file.ownerHint.ownerId;
     return references.some(reference => reference.sourceScope?.ownerType === "world" && reference.sourceScope.ownerId === worldId);
@@ -224,6 +225,11 @@ function shouldReportOrphan(file, references) {
   return false;
 }
 
+function isDerivedSceneThumbnail(file) {
+  const path = String(file.path ?? "");
+  return /^worlds\/[^/]+\/assets\/scenes\/[^/]+-thumb\.(?:png|webp)$/u.test(path);
+}
+
 export function createFileRecord(locator, size = null) {
   return {
     ...locator,