feat(games): sessioni 2-3 Blind Traders (opzioni/session/grid) + gate PORT06 e tooling reset

- Gioco GRID TRADERS (sessione 3, regola STRATEGIA_GRIGLIA.md): grid_engine
  (backtest causale fee-aware della griglia geometrica), grid_brief (digest
  anonimo per dimensionare la griglia), grid_arena (torneo 100 agenti);
  diario docs/diary/2026-06-10-grid-traders-game3.md
- Gioco OPZIONI: options_engine (BS + skew fittato + DVOL storica),
  options_arena, opt_calibrate (superficie premi REALE da cerbero-bite)
- Gioco SESSION: session_engine/session_arena (pattern orari intraday)
- arena: vincolo GAME_NO_LIVE=1 (vieta pairs e fade zscore/breakout/momentum
  gia' live, coercizione a trend/ma_cross) + normalize del candidato PRIMA
  della valutazione nel hill-climb
- Gate: grid_game_gate (griglia ETH vincitrice vs PORT06, mark-to-market),
  pairs30m_gate (ETH/BTC 30m ridondante col 15m gia' deployato?)
- reset_flatten: flatten one-shot del conto testnet per il reset portafoglio
- .gitignore: data/portfolio_paper_stats/ (stato runtime sleeve paper-only)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/games/run_game.py

@@ -14,6 +14,7 @@ import random
 from pathlib import Path
 
 from scripts.games import engine
+from scripts.games import arena
 from scripts.games.arena import random_spec, run_tournament, leaderboard, _normalize
 
 SPECS_DIR = Path(os.environ.get("GAME_SPECS_DIR", "data/games/specs"))
@@ -59,6 +60,9 @@ def load_specs():
 def main():
     slip = float(os.environ.get("GAME_SLIP", "0.0"))
     engine.set_slippage(slip)
+    if os.environ.get("GAME_NO_LIVE") == "1":
+        arena.set_no_live(True)
+        print("VINCOLO: solo strategie NON in live (no pairs, no zscore/breakout-reversion)")
     if slip > 0:
         print(f"SLIPPAGE attivo: {slip*100:.3f}%/lato "
               f"(single-leg {2*slip*100:.2f}% RT extra, pairs {4*slip*100:.2f}% extra)")