Charge 5 CNY per A-share trade via per-market fee table

Add MARKET_FEES {us: 2, cn: 5} so the monitor and cron (auto) paths
automatically apply the correct local-currency fixed commission without
needing a per-strategy override. CLI --fixed-fee still wins when set
explicitly for auto; monitor now always resolves from the table so its
banner and each strategy sub-call agree.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

trader.py

@@ -48,6 +48,16 @@ from strategies.recovery_momentum import RecoveryMomentumStrategy
 from strategies.trend_following import TrendFollowingStrategy
 from universe import UNIVERSES
 
+# ---------------------------------------------------------------------------
+# Per-market fixed trading fees (per trade, in the market's local currency)
+# ---------------------------------------------------------------------------
+# These are applied automatically by cmd_monitor and cmd_auto; they can still
+# be overridden by explicitly passing --fixed-fee on the CLI.
+MARKET_FEES = {
+    "us": 2.0,   # USD per trade
+    "cn": 5.0,   # CNY per trade (A-share minimum commission)
+}
+
 # ---------------------------------------------------------------------------
 # Strategy registry
 # ---------------------------------------------------------------------------
@@ -1088,12 +1098,13 @@ def cmd_monitor(args):
     print(f"  MONITOR MODE — {len(markets)} market(s), "
           f"{len(strategies)} strategies each")
     print(f"  Capital: ${args.capital:,.0f} | "
-          f"Fee: ${args.fixed_fee:.2f}/trade | "
           f"Integer shares: {args.integer_shares}")
     for mkt, sched in market_schedules.items():
+        fee = MARKET_FEES.get(mkt, args.fixed_fee)
         print(f"  {sched['label']}:")
         print(f"    Morning: {sched['morn_h']:02d}:{sched['morn_m']:02d} {sched['tz']}")
         print(f"    Evening: {sched['eve_h']:02d}:{sched['eve_m']:02d} {sched['tz']}")
+        print(f"    Fixed fee: {fee:.2f}/trade")
     print(f"  Strategies: {', '.join(strategies)}")
     print(f"{'='*60}")
 
@@ -1138,10 +1149,12 @@ def cmd_monitor(args):
               f"{now_local.strftime('%Y-%m-%d %H:%M:%S %Z')}")
         print(f"[monitor] {'='*55}")
 
+        market_fee = MARKET_FEES.get(market, args.fixed_fee)
         for strat_name in strategies:
             sub_args = copy.copy(args)
             sub_args.strategy = strat_name
             sub_args.market = market
+            sub_args.fixed_fee = market_fee
 
             print(f"\n[monitor] --- {market.upper()}:{strat_name} ---")
             try:
@@ -1295,8 +1308,10 @@ def cmd_auto(args):
         integer_shares=args.integer_shares
     )
 
+    # Fall back to per-market fee when the user didn't explicitly override
+    fixed_fee = args.fixed_fee if args.fixed_fee > 0 else MARKET_FEES.get(market, 0.0)
     execute_trades(state, trades, close_prices,
-                  tx_cost=args.tx_cost, fixed_fee=args.fixed_fee,
+                  tx_cost=args.tx_cost, fixed_fee=fixed_fee,
                   trade_date=today_str, integer_shares=args.integer_shares)
 
     post_value = portfolio_value(state["holdings"], close_prices, state["cash"])