TIMDEX subjects to sym

Author: JPrevost

app/models/normalize_timdex_record.rb

@@ -19,7 +19,7 @@ def normalize
       summary:,
       publisher:,
       location:,
-      'subjects' => subjects,
+      subjects:,
       # TIMDEX-specific fields
       'content_type' => content_type,
       'dates' => dates,

test/models/normalize_timdex_record_test.rb

@@ -156,12 +156,12 @@ def minimal_record
 
   test 'normalizes subjects' do
     normalized = NormalizeTimdexRecord.new(full_record, 'test').normalize
-    assert_equal ['Geographic Information Systems', 'Remote Sensing'], normalized['subjects']
+    assert_equal ['Geographic Information Systems', 'Remote Sensing'], normalized[:subjects]
   end
 
   test 'handles missing subjects' do
     normalized = NormalizeTimdexRecord.new(minimal_record, 'test').normalize
-    assert_empty normalized['subjects']
+    assert_empty normalized[:subjects]
   end
 
   # Test TIMDEX-specific fields