Vest: no leg opens past 8 PM ET until a sync has read the new day

The engine's Vest day now turns with the client's numbers, at the first
sync after the reset. A leg opened between 8 PM ET and that sync would be
planned and counted on the day that ended, so both the pick and the open
wait for it. The claim log's "stage N next" counts payouts the way the
engine picks its stage.

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

scripts/check-vest-client.mjs

@@ -58,7 +58,7 @@ const {
 const { vestDayOf, vestAccountId, VestApiError, VEST_STATUS_ACTIVE } = await import('../lib/vest-helpers.ts');
 const { encodeContractName } = await import('../lib/dxtrade-helpers.ts');
 const { tradeDateFor, stageInputsFor, resolveEffectiveConfig, claimedCycle, endedCycleCompletion } = await import('../lib/trading-logic.ts');
-const { isClientReady } = await import('../lib/platform-client.ts');
+const { isClientReady, isOrderNotPlaced } = await import('../lib/platform-client.ts');
 
 const iso = (s) => Date.parse(s);
 const WALLET = '0x7ce10771819f80130e204ddb5ca1522e48a9b451';
@@ -383,6 +383,10 @@ test("the client's Vest day turns with its numbers, and a sync that stalls stops
         assert.equal(vestDayOf(Date.now()), '2026-10-28');
         assert.equal(engineDay(), '2026-10-27');
         assert.equal(isClientReady(client), true);
+        // Nothing opens on the ended day's numbers.
+        const opening = await client.sendOrder(A, encodeContractName('NDX-USD', 0.001), 500, 'Buy', 'Market', undefined, 'open').catch((err) => err);
+        assert.equal(isOrderNotPlaced(opening), true);
+        assert.match(opening.message, /no sync has read it yet/);
         await client.requestSync();
         assert.equal(engineDay(), '2026-10-28');
         // No sync after the next reset: the day holds back only while the