Add Sentry, Pino logs, and OTel spans on WS pipeline (M2).

Capture REST/WS/SSE errors in Sentry, emit structured pino logs with correlation IDs, and trace the book-tick pipeline to Sentry via OpenTelemetry.

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

src/instrumentation/index.ts

@@ -0,0 +1,7 @@
+import { initOpenTelemetry } from "./otel.js";
+import { initSentry } from "./sentry.js";
+
+export function initInstrumentation(): void {
+  initSentry();
+  initOpenTelemetry();
+}