Vest: only a long closure holds entries back; the maintenance hour is ridden

The close gate held every Vest entry within four holds of any close,
which with a 2 h hold meant no weekday entry from about 9 AM to 5 PM ET
for the one-hour maintenance break. That hour reopens before the reset,
as CME's daily break does for futures legs, so only a weekend or holiday
closure gates an entry now.

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

lib/platform-client.ts

@@ -48,9 +48,10 @@ export interface PlatformContract {
     /** Margin posted per dollar of notional (0.2 = 5:1 leverage), where the
      *  broker says — caps a position at available funds ÷ this. */
     marginRate?: number;
-    /** When the instrument's market next closes (epoch ms), where the
-     *  platform says: no leg starts that wouldn't be done by then
-     *  (clearsClose), each account's at its own size (fireLeg). */
+    /** When the instrument's market next closes for long (epoch ms; Vest: a
+     *  weekend or holiday, not the maintenance hour), where the platform
+     *  says: no leg starts that wouldn't be done by then (clearsClose), each
+     *  account's at its own size (fireLeg). */
     closesAt?: number;
 }