Drain and extra-day legs always trade MNQ

They traded the micro of whatever the firm listed: MNQ with NQ, but MGC
for a firm listing only GC and CL. Now every futures firm's tiny legs go on
MNQ, the one micro the bot has always drained on.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/auto-trade.ts

@@ -23,7 +23,7 @@ import {
 } from './trading-logic';
 import { getSetting, setSetting } from './db';
 import type { LaneTick, TickReason } from './master-protocol';
-import { POINT_VALUES, housekeepingRoot, MAX_HOLD_HOURS } from './instrument-specs';
+import { POINT_VALUES, housekeepingRoot, HOUSEKEEPING_ROOT, MAX_HOLD_HOURS } from './instrument-specs';
 import { firmInstruments, drawFuturesInstrument, spreadBlock, type LegShape } from './instruments';
 import { recordEntry } from './trade-mix';
 import { errorMessage, isClientReady, isOrderNotPlaced, type PlatformClient, type PlatformContract, type PickContext } from './platform-client';
@@ -434,7 +434,7 @@ function releaseTradeMutex(lease: number, lane: string): void {
  *  housekeepingRoot); a DXtrade firm its current pick. */
 function housekeepingFor(firm: { platform: string; instruments?: string[]; bannedSymbols?: string[]; symbolMap?: Record<string, { symbol: string }[]> }): string {
     if (firm.platform === 'dxtrade') return '*';
-    return housekeepingRoot(firmInstruments(firm)) ?? 'MNQ';
+    return housekeepingRoot(firmInstruments(firm)) ?? HOUSEKEEPING_ROOT;
 }
 
 /** The instrument a leg actually trades: drain legs go on the firm's