Add Sentry dev probe and observability smoke test.

GET /api/debug/sentry, load .env.local for DSN, Playwright observability spec.

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

src/index.ts

@@ -1,3 +1,4 @@
+import "./load-env.js";
 import { initInstrumentation } from "./instrumentation/index.js";
 
 initInstrumentation();

src/interfaces/http/routes.ts

@@ -4,6 +4,7 @@ import {
   type Request,
   type Response,
 } from "express";
+import { Sentry } from "../../instrumentation/sentry.js";
 import type { ApplicationService } from "../../composition/application-service.js";
 import {
   bindRequestCorrelation,
@@ -39,6 +40,15 @@ export function createRouter(app: ApplicationService, sse: SseHub): Router {
     res.json({ success: true, data: { status: "ok", ts: Date.now() } });
   });
 
+  router.get("/debug/sentry", (_req: Request, res: Response) => {
+    if (process.env.NODE_ENV === "production") {
+      res.status(404).json({ error: "Not found" });
+      return;
+    }
+    Sentry.captureException(new Error("Arb Pulse Sentry test error"));
+    res.json({ ok: true, message: "Test error sent to Sentry" });
+  });
+
   router.get("/state", async (_req: Request, res: Response) => {
     const cached =
       await getCachedSnapshot<ReturnType<ApplicationService["getSnapshot"]>>();

src/load-env.ts

@@ -0,0 +1,9 @@
+import { existsSync } from "node:fs";
+import { loadEnvFile } from "node:process";
+
+for (const file of [".env.local", ".env"]) {
+  if (existsSync(file)) {
+    loadEnvFile(file);
+    break;
+  }
+}