feat(scaffold): add src/tracing.ts [skip ci]

src/tracing.ts

@@ -0,0 +1,19 @@
+// OTel SDK bootstrap — loaded via --require ./dist/tracing.js before the app.
+// Auto-configures from OTEL_* env vars set in score.yaml / Humanitec.
+// No-ops gracefully when OTEL_EXPORTER_OTLP_ENDPOINT is absent (local dev).
+import { NodeSDK } from '@opentelemetry/sdk-node';
+import { getNodeAutoInstrumentations } from '@opentelemetry/auto-instrumentations-node';
+
+const endpoint = process.env.OTEL_EXPORTER_OTLP_ENDPOINT;
+if (endpoint) {
+  const sdk = new NodeSDK({
+    instrumentations: [
+      getNodeAutoInstrumentations({
+        '@opentelemetry/instrumentation-fs': { enabled: false },
+      }),
+    ],
+  });
+
+  sdk.start();
+  process.on('SIGTERM', () => sdk.shutdown().finally(() => process.exit(0)));
+}