fix: wait for gateway ready before post-install model validation

Root cause: gateway restart is async (systemd), but validateNoReplyModelAvailable()
ran immediately after, hitting a race condition where the new gateway process
hadn't finished initializing yet. This caused 'model not listed' validation
failures, triggering config rollback even though the config was correct.

Changes:
- Add waitForGatewayReady() that polls 'openclaw gateway status' for RPC probe
- Add retry loop (5 attempts, 2s interval) to validateNoReplyModelAvailable()
- Fix CONFIG.example.json: contextWindow 4096->200000, maxTokens 64->8192
  (OpenClaw requires minimum 16000 contextWindow)

scripts/install-whispergate-openclaw.mjs

@@ -45,6 +45,42 @@ function runOpenclaw(args, { allowFail = false } = {}) {
   }
 }
 
+function sleep(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+async function waitForGatewayReady(maxWaitMs = 30000) {
+  const start = Date.now();
+  const interval = 1500;
+  while (Date.now() - start < maxWaitMs) {
+    const probe = runOpenclaw(["gateway", "status"], { allowFail: true }) || "";
+    if (probe.includes("RPC probe: ok")) return true;
+    console.log(`[whispergate] waiting for gateway ready... (${Math.round((Date.now() - start) / 1000)}s)`);
+    await sleep(interval);
+  }
+  return false;
+}
+
+async function validateNoReplyModelAvailable(retries = 5, delayMs = 2000) {
+  const modelRef = `${NO_REPLY_PROVIDER_ID}/${NO_REPLY_MODEL_ID}`;
+
+  for (let attempt = 1; attempt <= retries; attempt++) {
+    const list = runOpenclaw(["models", "list"], { allowFail: true }) || "";
+    if (list.includes(modelRef)) {
+      const status = runOpenclaw(["models", "status", "--json"], { allowFail: true }) || "";
+      if (status.includes(NO_REPLY_PROVIDER_ID)) {
+        console.log(`[whispergate] model validation passed on attempt ${attempt}`);
+        return;
+      }
+    }
+    if (attempt < retries) {
+      console.log(`[whispergate] model not yet visible (attempt ${attempt}/${retries}), retrying in ${delayMs}ms...`);
+      await sleep(delayMs);
+    }
+  }
+
+  throw new Error(`post-install validation failed: model not listed after ${retries} attempts: ${modelRef}`);
+}
 
 function getJson(pathKey) {
   const out = runOpenclaw(["config", "get", pathKey, "--json"], { allowFail: true });
@@ -162,15 +198,23 @@ if (mode === "install") {
     };
     setJson(PATH_PROVIDERS, providers);
 
+    runOpenclaw(["gateway", "restart"]);
+    console.log("[whispergate] gateway restart issued, waiting for ready...");
+    const ready = await waitForGatewayReady();
+    if (!ready) {
+      throw new Error("gateway did not become ready within 30s after restart");
+    }
+    console.log("[whispergate] gateway ready, validating model...");
+    await validateNoReplyModelAvailable();
+
     const after = {
       [PATH_PLUGINS_LOAD]: getJson(PATH_PLUGINS_LOAD),
       [PATH_PLUGIN_ENTRY]: getJson(PATH_PLUGIN_ENTRY),
       [PATH_PROVIDERS]: getJson(PATH_PROVIDERS),
     };
     writeRecord("install", before, after);
-    console.log("[whispergate] install ok (config written)");
+    console.log("[whispergate] install ok");
     console.log(`[whispergate] record: ${RECORD_PATH}`);
-    console.log("[whispergate] >>> restart gateway to apply: openclaw gateway restart");
   } catch (e) {
     fs.copyFileSync(BACKUP_PATH, OPENCLAW_CONFIG_PATH);
     console.error(`[whispergate] install failed; rollback complete: ${String(e)}`);