Drain-day randomness in $0.50 steps (MNQ tick value), $5.00–$15.00

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

lib/trading-logic.ts

@@ -133,9 +133,10 @@ export function currentTradeDateCT(now: Date = new Date()): string {
 
 /**
  * Drain-day target: the stage's min-day amount plus a deterministic bump of
- * $0/$5/$10 — so a $5 min day trades as $5, $10 or $15 depending on the
- * (account, trade date) pair. Seeded like dailyBump so every consumer of the
- * plan computes the same number.
+ * $0–$10 in $0.50 steps — MNQ's per-contract tick value, so every possible
+ * target lands on a realizable exit ($5 min day → $5.00, $5.50, … $15.00
+ * depending on the (account, trade date) pair). Seeded like dailyBump so
+ * every consumer of the plan computes the same number.
  */
 export function drainDayAmount(accountId: number, tradeDate: string, minDay: number): number {
     const key = `${accountId}|drain|${tradeDate}`;
@@ -144,7 +145,7 @@ export function drainDayAmount(accountId: number, tradeDate: string, minDay: num
         hash ^= key.charCodeAt(i);
         hash = Math.imul(hash, 0x01000193) >>> 0;
     }
-    return minDay + (hash % 3) * 5;
+    return round2(minDay + (hash % 21) * 0.5);
 }
 
 /**