Vest: a crypto leg's stop holds back the engine's default slippage, not NDX's

Crypto (exchangeInfo asset "crypto": BTC, ETH, SOL, HYPE) trades on weekends
when NDX, SPX and GC are shut, but its stop slippage on Vest is unmeasured, and
its book is a fraction of NDX's: about $10M an hour on a weekend against $600M,
with a batch's stops firing together. Its stops now leave 0.1% of the
position unspent (the engine's default) instead of the 0.02% measured on NDX
stop-outs; every other symbol keeps 0.02%.

The share rides on the picked contract and is used wherever a Vest leg's stop
is sized: the batch's plan, the leg's own stop, the dashboard's next stop, and
the 7:55 PM ET reset guard, which now sums each open position's own share.

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

lib/leg-estimate.ts

@@ -100,7 +100,7 @@ export function rankNextLeg(o: {
             maxLossRoom: floorRoom,
             obfuscationDollars: o.obfuscationDollars,
             availableFunds: funds,
-            slippageFraction: o.client.stopSlippageFraction,
+            slippageFraction: c.stopSlippageFraction ?? o.client.stopSlippageFraction,
         });
         const p = plan(true);
         if (!p.sizing || p.cost === null) return [];