Fix #3: Fix lambda closure bug in default_atomic_factory — capture target_shape by value

itt_solver/experiment_driver.py

@@ -100,13 +100,16 @@ def sweep(tasks, atomic_library_factory, grid, out_dir="experiments", max_runs=N
 def default_atomic_factory(params, task):
     import itt_solver.transforms as tr
     from itt_solver.solver_core import tile_transform  # ensure tile_transform is available here
+
+    # Capture target_shape by value to avoid late-binding closure bug
+    target_h, target_w = task['target_shape'][0], task['target_shape'][1]
+
     libs = []
     # always include tile and fill
-    libs.append(tr.Transform(lambda p: tile_transform(p, (task['target_shape'][0], task['target_shape'][1])), "tile_to_target"))
+    libs.append(tr.Transform(lambda p, _h=target_h, _w=target_w: tile_transform(p, (_h, _w)), "tile_to_target"))
     libs.append(tr.FillEnclosedHarmonic())
     # optional rotations/reflections
     if params.get('use_symmetry', True):
         libs.append(tr.Rotate(1))
         libs.append(tr.Reflect('h'))
     return libs
-