Hello world integration

npm install \
+@trigguard/execution-sdk \
+@trigguard/intent-sdk \
+@trigguard/surface-registry \
+@trigguard/express-middleware

import express from "express";
+import { trigguardMiddleware } from "@trigguard/express-middleware";
+import { defineSurface } from "@trigguard/surface-registry";
+
+const app = express();
+app.use(express.json());
+
+const spendCommit = defineSurface({
+  id: "payments.spendCommit",
+  description: "Commit outbound payment"
+});
+
+app.post("/payments/commit",
+  trigguardMiddleware({
+    surface: spendCommit,
+    onDecision: (decision) => {
+      if (decision !== "PERMIT") return;
+      throw new Error(`Execution denied by TrigGuard: ${decision}`);
+    }
+  }),
+  (_req, res) => {
+    res.json({ ok: true, committed: true });
+  }
+);
+
+app.listen(3000, () => console.log("listening on :3000"));

Keep this mapping explicit in integration code. Do not model decisions with alternate terms.