[tests] - fix CuPy display in test_learn_encoded_labels; enable model.load in test_linear

test_learn_encoded_labels: add .get() for cupy→numpy conversion before imshow;
reduce num_epochs 10000→1000.
test_linear: uncomment model.load() to resume from saved weights.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/tests/test_linear.py

@@ -40,7 +40,7 @@ def linear():
 	model.init(0.1)
 
 	# Load weights (if exists)
-#	model.load()
+	model.load()
 
 	# Prepare training data
 	training_batch = np.random.randn(N_CASES, N_VIS, dtype=np.float64)