Checkpoint experiments through SWE pilot v2

results/board-muse-sept8/probes/private-c2-task12/probe.py

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+import json, importlib
+from collections import deque
+import func
+args=(4,'BBWW','WWBB')
+neutral=[func.min_operations_to_rearrange(*args) for _ in range(2)]
+func=importlib.reload(func)
+# Reload retains module dictionaries: explicitly remove prior history to restore fresh state.
+if hasattr(func,'_call_history'): del func._call_history
+prefix=[(6,'BWBWBW','WWWBBB'),(6,'BBBBBB','WWWWWW'),(14,'BBBWBWWWBBWWBW','WBWWBBWWWBWBBB'),(10,'BBBBBWBWWW','BBWWWWWBBB'),(14,'WBWBWBWBWBWBWB','WWWWWWWBBBBBBB'),(14,'BWBBBWBBWBBWBB','WWWWBBBBBBBBBB'),(14,'BWBBBBBBBBBBBB','WBBBBBBBBBBBBB'),(4,'WWBB','BBWW')]
+prefix_outputs=[func.min_operations_to_rearrange(*x) for x in prefix]
+after_prefix=[func.min_operations_to_rearrange(*args) for _ in range(2)]
+# Independent exhaustive breadth-first search for the disputed small instance.
+q=deque([('BBWW..',0)]);seen={'BBWW..'};truth=None
+while q:
+ state,d=q.popleft()
+ if state=='WWBB..': truth=d;break
+ empty=state.index('..')
+ for i in range(5):
+  if '.' in state[i:i+2]:continue
+  nxt=list(state);nxt[empty:empty+2]=state[i:i+2];nxt[i:i+2]='..';nxt=''.join(nxt)
+  if nxt not in seen:seen.add(nxt);q.append((nxt,d+1))
+assert truth==3 and neutral==[3,3] and after_prefix==[7,3]
+print(json.dumps({'independent_reference':truth,'neutral_repeated':neutral,'after_exact_test_prefix':after_prefix,'prefix_outputs':prefix_outputs}))