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>

src/composition/application-service.ts

@@ -0,0 +1,94 @@
+import type { ConfigPatch, PublicConfig, StateSnapshot } from "../domain/entities/index.js";
+import { config } from "../infrastructure/config/config.js";
+import { runtime, runtimeDefaults } from "../infrastructure/config/runtime.js";
+import type { OrderBookManager } from "../infrastructure/state/order-book-manager.js";
+import type { Store } from "../infrastructure/state/store.js";
+import type { WalletBook } from "../infrastructure/state/wallet-book.js";
+import type { ControlService } from "../application/use-cases/control-service.js";
+
+/** REST/SSE facade wired at the composition root. */
+export class ApplicationService {
+  constructor(
+    private readonly store: Store,
+    private readonly quotes: OrderBookManager,
+    private readonly wallets: WalletBook,
+    private readonly controls: ControlService,
+  ) {}
+
+  getConfig(): PublicConfig {
+    return {
+      minNetProfitPct: runtime.minNetProfitPct,
+      maxTradeBtc: runtime.maxTradeBtc,
+      staleMs: config.staleMs,
+      flickerConfirmMs: runtime.flickerConfirmMs,
+      latencyMs: config.latencyMs,
+      activeExchanges: { ...runtime.activeExchanges },
+      defaults: {
+        minNetProfitPct: runtimeDefaults.minNetProfitPct,
+        maxTradeBtc: runtimeDefaults.maxTradeBtc,
+        flickerConfirmMs: runtimeDefaults.flickerConfirmMs,
+        activeExchanges: { ...runtimeDefaults.activeExchanges },
+      },
+      takerFees: config.takerFees,
+      withdrawalFeesBtc: config.withdrawalFeesBtc,
+    };
+  }
+
+  getSnapshot(): StateSnapshot {
+    const now = Date.now();
+    return {
+      ts: now,
+      quotes: this.quotes.bestQuotes(now),
+      wallets: this.wallets.all(),
+      stats: {
+        uptimeMs: now - this.store.startedAt,
+        ticksProcessed: this.store.ticksProcessed,
+        opportunitiesDetected: this.store.opportunitiesDetected,
+        tradesExecuted: this.store.tradesExecuted,
+        tradesRejected: this.store.tradesRejected,
+        realizedPnl: this.store.realizedPnl,
+        consecutiveLosses: this.store.consecutiveLosses,
+        circuit: this.store.circuit,
+        demoMode: runtime.demoMode,
+        avgTickMs: this.store.tickTimeEwma,
+      },
+      recentOpportunities: this.store.recentOpportunities(),
+      recentTrades: this.store.recentTrades(),
+      rebalances: this.store.recentRebalances(),
+      pnlSeries: this.store.pnlSeries(),
+      config: this.getConfig(),
+    };
+  }
+
+  patchConfig(patch: ConfigPatch): string | null {
+    return this.controls.patchConfig(patch);
+  }
+
+  pause(): void {
+    this.controls.pause();
+  }
+
+  resume(): void {
+    this.controls.resume();
+  }
+
+  reset(): void {
+    this.controls.reset();
+  }
+
+  setDemoMode(enabled: boolean): void {
+    this.controls.setDemoMode(enabled);
+  }
+
+  setRecordFeed(enabled: boolean): void {
+    this.controls.setRecordFeed(enabled);
+  }
+
+  setThreshold(pct: number): string | null {
+    return this.controls.setThreshold(pct);
+  }
+
+  setMaxTradeBtc(btc: number): string | null {
+    return this.controls.setMaxTradeBtc(btc);
+  }
+}