Tradeify247: each person sizes a little apart from everyone else

Every machine sized a like account in a like state to the same position as
every other person's, so two people's positions could match to the unit.
Each person now draws a size factor in [0.85, 1.15] per trade date, seeded
by the master's uuid for them; all of one person's accounts share it.

The factor moves the hold a DXtrade leg is sized for (hold / factor², since
size goes as 1/√hold), so the instrument pick, the dashboard's next leg and
the Firms page's reach test all see the hold the size was made for.

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

lib/leg-estimate.ts

@@ -11,9 +11,10 @@ import type { PlatformContract } from './platform-client';
 import type { SymbolStats } from './master-protocol';
 import {
     combineCmeSessions, computeDayPlan, resolveEffectiveConfig, obfuscationStopDollars, dllRoom as computeDllRoom,
-    planLegSize, rankForTarget, maxLossRoom, lastStand, dllStopDollars, DEFAULT_TARGET_HOLD_HOURS,
+    planLegSize, rankForTarget, maxLossRoom, lastStand, dllStopDollars,
     FALLBACK_COMMISSION_PER_CONTRACT,
 } from './trading-logic';
+import { sizingHoldHours } from './person-size';
 
 export type CandidateLeg = SymbolStats['symbols'][number] & {
     swapReserve: number;
@@ -39,10 +40,12 @@ export function rankNextLeg(o: {
     dllRoom: number | null;
     obfuscationDollars: number;
     cash: { amount: number; availableFunds?: number };
+    /** The trade date the hold is drawn for (sizingHoldHours); default today. */
+    tradeDate?: string;
 }): CandidateLeg[] {
     const candidates: PlatformContract[] = o.client.lastCandidates ?? [];
     if (!(o.leg > 0) || candidates.length === 0) return [];
-    const target = o.firm.targetHoldHours || DEFAULT_TARGET_HOLD_HOURS;
+    const target = sizingHoldHours(o.firm, o.tradeDate);
     const floorRoom = maxLossRoom({
         balance: o.cash.amount, accountSize: o.cfg.accountSize, maxLoss: o.cfg.maxLoss ?? 0,
         autoLiqThreshold: o.client.autoLiqThresholds?.[o.accountId],
@@ -145,7 +148,7 @@ export function accountNextLeg(
         lastStand: p.room !== null && lastStand({ dllRoom: p.room, dailyLossLimit: p.dll, maxLossRoom: floorRoom }),
         candidates: rankNextLeg({
             client, accountId: acc.id, cfg: p.cfg, firm, leg: p.plan.remainingToday, dllRoom: p.room,
-            obfuscationDollars: p.obfuscation, cash: p.cash,
+            obfuscationDollars: p.obfuscation, cash: p.cash, tradeDate,
         }),
     };
 }