Futures legs respect a firm's per-instrument contract limit

A firm can cap how many contracts of an instrument its accounts may hold
(the catalog's instrumentLimits, set on the master's Firms page). A leg
trades one contract per $1,000, capped by the account type's max contracts
and that limit. The Auto draw sizes each instrument's hold with the capped
count, so a limit that slows a leg past 12 hours takes it out of the draw.

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

lib/firm-catalog.ts

@@ -18,7 +18,7 @@
  */
 
 import { isFirmPlatform } from './master-protocol';
-import { sanitizeInstruments, DEFAULT_MAX_ENTRY_SPREAD } from './instrument-specs';
+import { sanitizeInstruments, sanitizeInstrumentLimits, DEFAULT_MAX_ENTRY_SPREAD } from './instrument-specs';
 import type {
     CatalogAccountType, CatalogFirm, CatalogTradingSettings, FirmCatalogPayload, FirmPlatform, SymbolMap, SymbolMapCandidate,
 } from './master-protocol';
@@ -245,6 +245,7 @@ function validatePayload(raw: unknown): FirmCatalogPayload {
             // The master's list when it sends one; absent from an older
             // master, whose bannedSymbols / symbolMap then apply.
             ...(Array.isArray(firm.instruments) ? { instruments: sanitizeInstruments(platform, firm.instruments) } : {}),
+            ...(platform !== 'dxtrade' ? { instrumentLimits: sanitizeInstrumentLimits(firm.instrumentLimits) } : {}),
             bannedSymbols: Array.isArray(firm.bannedSymbols) ? (firm.bannedSymbols as string[]) : [],
             accountTypes,
             serverUrl: typeof firm.serverUrl === 'string' ? firm.serverUrl : '',