fix(ci): skip numpy/torch tests in CI with pytest.importorskip

All Factorio ML test files now use pytest.importorskip() for numpy
and torch — tests skip cleanly when deps aren't installed in CI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: SwiftWing21

tests/factorio/test_bridge_ml_mode.py

@@ -1,6 +1,6 @@
 """Integration smoke tests for bridge ML mode (Task 9)."""
 import pytest
-import numpy as np
+np = pytest.importorskip("numpy")
 from factorio.bridge_config import BridgeConfig
 
 

tests/factorio/test_ml_e2e.py

@@ -1,9 +1,9 @@
 """End-to-end smoke test: state -> encode -> policy -> action -> reward -> train.
 Uses mock data -- no Factorio server required.
 """
-import numpy as np
-import torch
 import pytest
+np = pytest.importorskip("numpy")
+torch = pytest.importorskip("torch")
 
 from factorio.state_parser import GameState, Entity
 from factorio.state_encoder import StateEncoder

tests/factorio/test_ml_policy.py

@@ -1,6 +1,6 @@
-import numpy as np
-import torch
 import pytest
+np = pytest.importorskip("numpy")
+torch = pytest.importorskip("torch")
 from factorio.ml_policy import FactorioPolicy
 from factorio.action_space import ActionType
 

tests/factorio/test_pack_integration.py

@@ -1,7 +1,7 @@
 # tests/factorio/test_pack_integration.py
 """Integration test: pack registry → executor → reward → policy pipeline."""
-import torch
 import pytest
+torch = pytest.importorskip("torch")
 
 
 def test_pack_roundtrip():

tests/factorio/test_policy_packs.py

@@ -1,4 +1,5 @@
-import torch
+import pytest
+torch = pytest.importorskip("torch")
 
 
 def test_policy_has_pack_heads():

tests/factorio/test_state_encoder.py

@@ -1,5 +1,5 @@
-import numpy as np
 import pytest
+np = pytest.importorskip("numpy")
 from factorio.state_parser import GameState, Entity
 from factorio.state_encoder import StateEncoder, _BASE_FEATURE_DIM
 

tests/factorio/test_state_encoder_pack.py

@@ -1,6 +1,6 @@
 """Tests for pack_progress feature in StateEncoder."""
-import numpy as np
 import pytest
+np = pytest.importorskip("numpy")
 
 
 def test_feature_dim_includes_pack_progress():

tests/factorio/test_state_encoder_spatial.py

@@ -1,5 +1,5 @@
-import numpy as np
 import pytest
+np = pytest.importorskip("numpy")
 from factorio.state_parser import GameState
 from factorio.state_encoder import StateEncoder
 from factorio.spatial_memory import SpatialMemory

tests/factorio/test_trainer.py

@@ -1,8 +1,8 @@
 """Tests for PPOTrainer, TrajectoryBuffer, and Transition."""
 
-import numpy as np
 import pytest
-import torch
+np = pytest.importorskip("numpy")
+torch = pytest.importorskip("torch")
 
 from factorio.trainer import PPOTrainer, TrajectoryBuffer, Transition
 from factorio.ml_policy import FactorioPolicy