Restore safe alpha 0.8 default at head (A/B candidate remains selectable at 296f8f2)

batteryswap_example/submit.py

@@ -277,7 +277,7 @@ def _fit_model(train):
 # each extra inclusion converts late->early at a worsening exchange rate, and
 # late saturates ~1100 regardless - the remaining misses are voltage-silent
 # deaths that no inclusion appetite can catch.
-ALPHA = float(os.environ.get('BATTERYSWAP_ALPHA', '1.0'))
+ALPHA = float(os.environ.get('BATTERYSWAP_ALPHA', '0.8'))
 # Phase 26 adopted ALPHA_STATIC=1.5 from the half-fleet holdout ("the static
 # foreign fit undercounts sum(p42)"). PUBLIC REFUTED IT (2026-08-20,
 # submission 6ea03da: 2188.78 vs 1661.45, battery_swap +68%, early +444,
@@ -287,7 +287,7 @@ ALPHA = float(os.environ.get('BATTERYSWAP_ALPHA', '1.0'))
 # The half-fleet construction manufactures the undercount; do not trust it
 # for appetite decisions. Late cost is saturated by voltage-silent deaths
 # that no inclusion appetite can catch (phases 1/6). Default back to 0.8.
-ALPHA_STATIC = float(os.environ.get('BATTERYSWAP_ALPHA_STATIC', '1.0'))
+ALPHA_STATIC = float(os.environ.get('BATTERYSWAP_ALPHA_STATIC', '0.8'))
 # Break-even top-up (phase 11): additionally include every FRESH battery
 # (imputed EOL beyond the window) whose best-day expected cost beats parking,
 # gated to fire only where a wrong inclusion costs <= EC_PMAX. Empty at