Add volume-based contract auto-resolver and CLAUDE.md

- New lib/contract-resolver.ts: picks the best contract month for each
  symbol by comparing Yahoo Finance volume between the front month
  (Tradovate suggest API) and the roll target (rollcontract API)
- lib/clients.ts: auto-resolves all enabled instruments 15s after startup
  and again daily at midnight via a setInterval check
- lib/tradovate-class.ts: findFrontMonthContract checks resolver cache
  first before falling back to the suggest API
- app/api/instruments/contracts/route.ts: GET returns cached contracts,
  POST triggers a fresh resolve
- app/settings/page.tsx: shows active contract + rolled badge per symbol;
  auto-resolves on load if cache is empty; removed manual Resolve button
- app/api/debug/route.ts: include entity data in recentEntityEvents
- CLAUDE.md: instructs Claude to always work on main

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/api/debug/route.ts

@@ -28,10 +28,11 @@ export async function GET() {
                     dailyPnLEntries: (client.dailyPnL[acc.id] ?? []).length,
                     dailyPnL: client.dailyPnL[acc.id] ?? [],
                 })),
-                recentEntityEvents: client.recentEntityEvents.slice(-3).map((e) => ({
+                recentEntityEvents: client.recentEntityEvents.slice(-10).map((e) => ({
                     ts: new Date(e.ts).toISOString(),
                     entityType: e.entityType,
                     eventType: e.eventType,
+                    entity: e.entity,
                 })),
             };
         });