Add pi-langfuse extension (Langfuse LLM observability for pi) — vendored from npm 1.5.8

extensions/pi-langfuse/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "include": [
+    "index.ts",
+    "src/**/*.ts",
+    "types/**/*.d.ts"
+  ]
+}