fix: harden post-stop reentry lockdown

scripts/run_gate_protected_stop_study.py

@@ -330,7 +330,7 @@ async def _main() -> None:
         benchmark_closes,
         exit_policy,
         hold_days,
-        reentry_cooldown_days=5,
+        reentry_cooldown_sessions=5,
         **sim_kwargs,
     )
     cooldown_10 = bt._simulate_portfolio(
@@ -339,7 +339,7 @@ async def _main() -> None:
         benchmark_closes,
         exit_policy,
         hold_days,
-        reentry_cooldown_days=10,
+        reentry_cooldown_sessions=10,
         **sim_kwargs,
     )
     refresher = GateStopRefresher(