Vest: no leg opens into a market close, and accounts plan on Vest's day

Market close: a Vest entry now needs its symbol's market to stay open
for RESET_CLEAR_HOLDS holds of the leg (clearsClose), the clearance the
8 PM ET reset already gets: at the target hold, and at the leg's sized
hold when a leverage cap stretches it. That covers the weekly close and
the daily maintenance hour as Vest's market-hours periods list them.
Before a closure that runs past an 8 PM ET reset (the weekend, a
holiday: longClosure), the bot's own legs still open in the last 5
minutes are closed at market, loudly; a position the bot didn't open is
named in the log and left alone.

Vest's day: Vest accounts are planned, and their legs and entries
counted, on Vest's day (20:00 ET) instead of the Central date
(tradeDateFor, PlatformClient.tradeDate). Between 5 PM CT and the reset
the Central date counted the open Vest day as a prior day and as today's
realized P&L both ($3,000 to go, $800 made: $2,050 left, not $1,900) and
started the leg count over. Other platforms keep the Central date.

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

lib/vest-helpers.ts

@@ -540,7 +540,19 @@ export function hourlyVolatility(klines: unknown[]): number | null {
  */
 export function marketOpen(periods: unknown, now: number): { open: boolean; closesAt: number | null } {
     if (!Array.isArray(periods) || periods.length === 0) return { open: true, closesAt: null };
-    const list = periods.flatMap((p) => {
+    const list = hoursPeriods(periods);
+    const i = list.findIndex((p) => p.from <= now && now < p.to);
+    if (i < 0 || !list[i].open) return { open: false, closesAt: null };
+    // Consecutive open periods (overnight → pre-market → regular …) are one stretch.
+    let end = list[i].to;
+    for (let j = i + 1; j < list.length && list[j].open && list[j].from <= end + 1; j++) end = list[j].to;
+    return { open: true, closesAt: end };
+}
+
+/** The market-hours periods, read and in order; open = trading, with no
+ *  closure (see marketOpen). */
+function hoursPeriods(periods: unknown[]): { from: number; to: number; open: boolean }[] {
+    return periods.flatMap((p) => {
         const r = p as {
             fromMs?: unknown; toMs?: unknown;
             state?: { tradingStatus?: unknown; closure?: unknown; price?: { allow?: unknown } };
@@ -553,10 +565,20 @@ export function marketOpen(periods: unknown, now: number): { open: boolean; clos
             && (closure === undefined || closure === 'unspecified');
         return [{ from, to, open }];
     }).sort((a, b) => a.from - b.from);
-    const i = list.findIndex((p) => p.from <= now && now < p.to);
-    if (i < 0 || !list[i].open) return { open: false, closesAt: null };
-    // Consecutive open periods (overnight → pre-market → regular …) are one stretch.
-    let end = list[i].to;
-    for (let j = i + 1; j < list.length && list[j].open && list[j].from <= end + 1; j++) end = list[j].to;
-    return { open: true, closesAt: end };
+}
+
+/**
+ * Whether the closure that starts at `closesAt` (marketOpen's) keeps the
+ * market shut across one of Vest's 8 PM ET resets — a weekend, a holiday —
+ * or for as far as the periods go. A position held into it can't be exited
+ * or fitted to that reset until the market reopens, and meets the reopen's
+ * gap with its stop; the daily maintenance hour reopens before the reset.
+ * A close the periods don't show (they just end there) isn't one.
+ */
+export function longClosure(periods: unknown, closesAt: number): boolean {
+    if (!Array.isArray(periods)) return false;
+    const list = hoursPeriods(periods);
+    if (!list.some((p) => p.to > closesAt)) return false;
+    const reopensAt = list.find((p) => p.open && p.from >= closesAt)?.from;
+    return reopensAt === undefined || nextVestResetMs(closesAt) < reopensAt;
 }