Initial commit: Arb Pulse monolith with CI and optional Fly deploy.

Real-time BTC cross-exchange arbitrage detection (Kraken, Bybit, OKX, Binance)
with React dashboard, GitHub Actions CI, and documented Fly.io deploy workflow.

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

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+# Server
+PORT=8080
+
+# Engine tuning
+MIN_NET_PROFIT_PCT=0.0005      # 0.05% minimum net return to execute
+MAX_TRADE_BTC=0.25             # max BTC per simulated trade
+STALE_MS=3000                  # quote older than this is ignored
+FLICKER_CONFIRM_MS=150         # opportunity must persist this long before executing
+LATENCY_MS=120                 # simulated detection->execution latency
+LATENCY_SLIPPAGE_BPS=2         # adverse price drift applied during latency (basis points)
+
+# Risk
+CIRCUIT_BREAKER_LOSSES=5       # consecutive losing trades before pausing
+CIRCUIT_BREAKER_COOLDOWN_MS=15000
+
+# Wallets (per exchange, simulated)
+INITIAL_USDT=50000
+INITIAL_BTC=0.5
+
+# Demo mode (injects synthetic divergences, clearly flagged)
+DEMO_MODE=false
+
+# Feed recorder (NDJSON to data/)
+RECORD_FEED=false