fix: add BOM stripping to workflow URL parsing

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Eli Cortez

.github/workflows/migrate-blob-to-release.yml

@@ -92,9 +92,10 @@ jobs:
             # Skip blank lines and comment lines
             [[ -z "$RAW_URL" || "$RAW_URL" == \#* ]] && continue
 
-            # Trim trailing whitespace/CR
+            # Trim trailing whitespace/CR and leading UTF-8 BOM if present
             URL="${RAW_URL%$'\r'}"
             URL="${URL%  }"
+            URL="${URL#$'\xef\xbb\xbf'}"
 
             # Derive a safe asset filename from the URL path
             BLOB_PATH="${URL#*blob.core.windows.net/*/}"