chore: bump OpenClaw to v2026.3.7 and use TCP readiness probe

Dockerfile

@@ -22,7 +22,7 @@ WORKDIR /openclaw
 
 # Pin to a known-good ref (tag/branch). Override in Railway template settings if needed.
 # Using a released tag avoids build breakage when `main` temporarily references unpublished packages.
-ARG OPENCLAW_GIT_REF=v2026.2.9
+ARG OPENCLAW_GIT_REF=v2026.3.7
 RUN git clone --depth 1 --branch "${OPENCLAW_GIT_REF}" https://github.com/openclaw/openclaw.git .
 
 # Patch: relax version requirements for packages that may reference unpublished versions.

src/server.js

@@ -1,3 +1,5 @@
+import { createRequire } from 'module';
+const require = createRequire(import.meta.url);
 import childProcess from "node:child_process";
 import crypto from "node:crypto";
 import fs from "node:fs";
@@ -151,21 +153,7 @@ async function waitForGatewayReady(opts = {}) {
   const timeoutMs = opts.timeoutMs ?? 20_000;
   const start = Date.now();
   while (Date.now() - start < timeoutMs) {
-    try {
-      // Try the default Control UI base path, then fall back to root.
-      const paths = ["/openclaw", "/"];
-      for (const p of paths) {
-        try {
-          const res = await fetch(`${GATEWAY_TARGET}${p}`, { method: "GET" });
-          // Any HTTP response means the port is open.
-          if (res) return true;
-        } catch {
-          // try next
-        }
-      }
-    } catch {
-      // not ready
-    }
+    if (await probeGateway()) return true;
     await sleep(250);
   }
   return false;
@@ -242,6 +230,7 @@ async function ensureGatewayRunning() {
         if (!ready) {
           throw new Error("Gateway did not become ready in time");
         }
+        lastGatewayError = null;
       } catch (err) {
         const msg = `[gateway] start failure: ${String(err)}`;
         lastGatewayError = msg;
@@ -1494,4 +1483,4 @@ process.on("SIGTERM", () => {
   }
 
   setTimeout(() => process.exit(0), 5_000).unref?.();
-});
+});                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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test/healthz-probe.test.js

@@ -7,3 +7,8 @@ test("healthz implements probeGateway (TCP connect)", () => {
   assert.match(src, /async function probeGateway\(/);
   assert.match(src, /node:net/);
 });
+
+test("gateway startup readiness uses the TCP probe", () => {
+  const src = fs.readFileSync(new URL("../src/server.js", import.meta.url), "utf8");
+  assert.match(src, /async function waitForGatewayReady[\s\S]*await probeGateway\(\)/);
+});