fix: Database-first cluster status detection + Stop button clarification

CRITICAL FIX (Nov 30, 2025):
- Dashboard showed 'idle' despite 22+ worker processes running
- Root cause: SSH-based worker detection timing out
- Solution: Check database for running chunks FIRST

Changes:
1. app/api/cluster/status/route.ts:
   - Query exploration database before SSH detection
   - If running chunks exist, mark workers 'active' even if SSH fails
   - Override worker status: 'offline' → 'active' when chunks running
   - Log: '✅ Cluster status: ACTIVE (database shows running chunks)'
   - Database is source of truth, SSH only for supplementary metrics

2. app/cluster/page.tsx:
   - Stop button ALREADY EXISTS (conditionally shown)
   - Shows Start when status='idle', Stop when status='active'
   - No code changes needed - fixed by status detection

Result:
- Dashboard now shows 'ACTIVE' with 2 workers (correct)
- Workers show 'active' status (was 'offline')
- Stop button automatically visible when cluster active
- System resilient to SSH timeouts/network issues

Verified:
- Container restarted: Nov 30 21:18 UTC
- API tested: Returns status='active', activeWorkers=2
- Logs confirm: Database-first logic working
- Workers confirmed running: 22+ processes on worker1, workers on worker2

diagnostic_trade_results.txt

@@ -0,0 +1,31 @@
+================================================================================
+V9 TRADE ANALYSIS
+================================================================================
+
+================================================================================
+BASELINE COMPARISON
+================================================================================
+
+Loading data and running simulations...
+
+Running baseline config...
+  Trades: 581
+  PnL: $-1852.60
+  WR: 0.6%
+
+Running best sweep config...
+  Trades: 581
+  PnL: $-1835.05
+  WR: 0.6%
+
+Improvement: $17.55 (-0.9%)
+Traceback (most recent call last):
+  File "scripts/trade_analysis.py", line 218, in <module>
+    main()
+  File "scripts/trade_analysis.py", line 204, in main
+    analyze_trades(trades)
+  File "scripts/trade_analysis.py", line 30, in analyze_trades
+    winners = [t for t in trades if t.pnl > 0]
+  File "scripts/trade_analysis.py", line 30, in <listcomp>
+    winners = [t for t in trades if t.pnl > 0]
+AttributeError: 'SimulatedTrade' object has no attribute 'pnl'