[runtime] stabilize verify route closure and timeout expression

Why: /verify had a fragile inline timer/reason expression in the route block that needed an explicit, syntactically robust structure while preserving behavior and a single route close.

Contract impact: none

Author: GsCommand

server.mjs

@@ -1544,7 +1544,9 @@ for (const v of Object.keys(handlers)) {
 }
 
 app.post("/verify", async (req, res) => {
-  const timer = new Promise((_, rej) => setTimeout(() => rej(new Error("verify_timeout")), VERIFY_MAX_MS));
+  const timer = new Promise((_, rej) => {
+    setTimeout(() => rej(new Error("verify_timeout")), VERIFY_MAX_MS);
+  });
   const runVerify = async () => {
     const receipt = req.body;
 
@@ -1732,9 +1734,11 @@ app.post("/verify", async (req, res) => {
 
     const okFinal = hashMatches === true && signatureValid === true && (wantSchema ? schemaOk === true : true);
 
+    const failureReason = sigErr || (wantSchema && !schemaOk ? "schema_invalid" : "verify_failed");
+
     return res.json({
       ok: okFinal,
-      ...(okFinal ? {} : { reason: sigErr || (wantSchema && !schemaOk ? "schema_invalid" : "verify_failed") }),
+      ...(okFinal ? {} : { reason: failureReason }),
       signer_id: proof?.signer_id ?? null,
       kid: proof?.kid ?? null,
       hash_sha256: proof?.hash_sha256 ?? null,