fix: retry failed model inspections and preserve rejection evidence

Do not cache transient repository-list failures as empty weight sets.
Deduplicate normalized file paths without lowering reported file sizes.
Record whitelisted OOM evidence and bounded discovery diagnostics.

modelhub_submmit_api/models.py

@@ -140,12 +140,17 @@ class ModelInspection:
         return None
 
     @property
-    def repository_size_bytes(self) -> int | None:
+    def exact_repository_size_bytes(self) -> int | None:
         """Return exact recursive on-disk size when every file has a size."""
-        exact: int | None = None
         if self.file_paths and not any(path not in self.file_sizes for path in self.file_paths):
             total = sum(max(0, int(self.file_sizes[path])) for path in self.file_paths)
-            exact = total if total > 0 else None
+            return total if total > 0 else None
+        return None
+
+    @property
+    def repository_size_bytes(self) -> int | None:
+        """Use the conservative maximum of recursive and published sizes."""
+        exact = self.exact_repository_size_bytes
         published = int(self.published_size_bytes or 0) or None
         values = [value for value in (exact, published) if value is not None]
         return max(values) if values else None