feat(assessment): Increase Dataset Row Fetch Limit

backend/app/api/docs/assessment/get_dataset.md

@@ -2,6 +2,6 @@ Get a single assessment dataset by ID.
 
 Optionally include a signed URL to download the original uploaded file.
 
-Pass `limit_rows=N` (1-100) to additionally include a lightweight preview
+Pass `limit_rows=N` (1-2000) to additionally include a lightweight preview
 of the dataset's column headers and the first N data rows. When omitted,
 the underlying file is not fetched and the response stays small.

backend/app/api/routes/assessment/datasets.py

@@ -118,7 +118,7 @@ def get_dataset(
         int | None,
         Query(
             ge=1,
-            le=100,
+            le=2000,
             description=(
                 "If set, fetch the underlying file and include a preview of the "
                 "first N data rows plus column headers. Skip to avoid the file "