fix(cutover): separate api health from gateway readiness

apps/api/src/cutover-orchestrator.ts

@@ -72,11 +72,12 @@ function runFile(file: string, args: readonly string[]): Promise<string> {
 
 function authenticatedReady(port: 8788 | 8790, gatewayToken: string): Promise<boolean> {
   return new Promise((resolvePromise) => {
+    const path = port === 8790 ? '/healthz' : '/readyz';
     const req = request(
       {
         host: '127.0.0.1',
         port,
-        path: '/readyz',
+        path,
         timeout: 2_000,
         headers: { [GATEWAY_AUTH_HEADER]: gatewayToken },
       },
@@ -364,7 +365,7 @@ export async function preflight(
 ): Promise<void> {
   requireGatewayToken(gatewayToken);
   if (!(await system.ready(8790, gatewayToken)))
-    throw new Error('Authenticated API readiness preflight failed on 127.0.0.1:8790/readyz');
+    throw new Error('Authenticated API health preflight failed on 127.0.0.1:8790/healthz');
   const indexPath = join(await realpath(plan.assetDir), 'index.html');
   const asset = await lstat(indexPath);
   if (!asset.isFile()) throw new Error('assetDir/index.html must be a regular file');