Add missing random seed to test_output_shape_1d

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

Author: edeno

src/non_local_detector/tests/test_analysis_posterior.py

@@ -78,6 +78,7 @@ def test_multiple_timesteps(self):
 
     def test_output_shape_1d(self):
         """1D posterior should return (n_time, 1)."""
+        np.random.seed(42)
         positions = np.linspace(0, 10, 20)
         probs = np.random.dirichlet(np.ones(20), size=3)
         posterior = xr.DataArray(