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>

playwright.config.ts

@@ -0,0 +1,24 @@
+import { defineConfig, devices } from "@playwright/test";
+
+export default defineConfig({
+  testDir: "e2e",
+  fullyParallel: false,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: 1,
+  timeout: 60_000,
+  reporter: process.env.CI ? "github" : "html",
+  use: {
+    baseURL: "http://localhost:8080",
+    trace: "on-first-retry",
+  },
+  projects: [{ name: "chromium", use: { ...devices["Desktop Chrome"] } }],
+  ...(!process.env.CI && {
+    webServer: {
+      command: "npm start",
+      url: "http://localhost:8080/api/health",
+      reuseExistingServer: !process.env.PW_FRESH_SERVER,
+      env: { DEMO_MODE: "true" },
+    },
+  }),
+});