all48oof static: EXACT leave-one-building-out predictions per user spec (24 models on 23 buildings each, was 5 fold models on ~19); SCORE 1913.3 -> 1877.3

batteryswap_example/cv.py

@@ -655,7 +655,14 @@ def run_all48_oof(n_folds=5, seed=0, origins=range(48),
                 .drop_duplicates('device_id')
                 .set_index('device_id')['building_id'])
     closed = t[t['origin'] <= t['origin'].max() - pd.Timedelta(days=WINDOW_DAYS)]
-    bldg_fold = building_folds(closed, dev_bldg, n_folds, seed)
+    if fit == 'static':
+        # EXACT leave-one-building-out predictions (user spec 2026-08-22):
+        # every device's model excludes precisely its own building - 24
+        # models on 23 buildings each, not 5 fold models on ~19. Folds are
+        # only a cost-saving for the per-origin walkforward variant.
+        bldg_fold = pd.Series({b: b for b in dev_bldg.unique()})
+    else:
+        bldg_fold = building_folds(closed, dev_bldg, n_folds, seed)
 
     p = mc.plan_tsroute
     p.alpha, p.p_be, p.floor_day, p.p_conf = CHAMPION['p_star'], 0.0, 0, 0.5