feat(env): Number Sorting Curriculum (#321)

* number sorting curriculum

* metadata

tests/test_number_sorting.py

@@ -2,7 +2,7 @@
 
 import pytest
 
-from reasoning_gym.algorithmic.number_sorting import NumberSortingConfig, NumberSortingDataset
+from reasoning_gym.algorithmic.number_sorting import NumberSortingConfig, NumberSortingCurriculum, NumberSortingDataset
 
 
 def test_number_sorting_config_validation():
@@ -89,3 +89,31 @@ def test_number_sorting_dataset_iteration():
 
     # Test multiple iterations yield same items
     assert items == list(dataset)
+
+
+def test_number_sorting_curriculum():
+    curriculum = NumberSortingCurriculum()
+
+    base_value = {"size": 150, "seed": 1}
+
+    base_cfg: NumberSortingConfig = curriculum.generate_configuration(base_value)
+    assert base_cfg.seed == 1
+    assert base_cfg.size == 150
+    assert base_cfg.min_numbers == 10 and base_cfg.max_numbers == 100
+    assert base_cfg.min_decimals == 0 and base_cfg.max_decimals == 2
+    assert base_cfg.min_value == -10_000 and base_cfg.max_value == 10_000
+
+    # test incrementing some attribute levels
+    curriculum.increment_attr_level("numbers")
+    curriculum.increment_attr_level("decimals")
+    increased_cfg = curriculum.generate_configuration(base_value)
+    assert increased_cfg.min_numbers == 10 and increased_cfg.max_numbers == 500
+    assert increased_cfg.min_decimals == 0 and increased_cfg.max_decimals == 4
+    assert increased_cfg.min_value == -10_000 and increased_cfg.max_value == 10_000
+
+    # test decrementing attribute level for numbers again
+    curriculum.decrement_attr_level("numbers")
+    partially_decreased_cfg = curriculum.generate_configuration(base_value)
+    assert partially_decreased_cfg.min_numbers == 10 and partially_decreased_cfg.max_numbers == 100
+    assert partially_decreased_cfg.min_decimals == 0 and partially_decreased_cfg.max_decimals == 4
+    assert partially_decreased_cfg.min_value == -10_000 and partially_decreased_cfg.max_value == 10_000