fix: harden release gate and page delivery

server/portal-agent-services-bootstrap.mjs

@@ -185,21 +185,23 @@ export async function bootstrapPortalAgentServices({
   const wordFilterService =
     createWordFilterServiceFn(pool);
 
-  const relayBootstrapTask = llmProviderService
-    .ensureBootstrapRelay()
-    .then((result) => {
-      if (result.created) {
-        logger.log(
-          `LLM relay bootstrap created: ${relayBootstrap.name}`,
+  const relayBootstrapTask = env.H5_RELAY_BOOTSTRAP_DISABLED === '1'
+    ? Promise.resolve({ ok: true, created: false, skipped: true })
+    : llmProviderService
+      .ensureBootstrapRelay()
+      .then((result) => {
+        if (result.created) {
+          logger.log(
+            `LLM relay bootstrap created: ${relayBootstrap.name}`,
+          );
+        }
+      })
+      .catch((error) => {
+        logger.warn(
+          'LLM relay bootstrap skipped:',
+          error instanceof Error ? error.message : error,
         );
-      }
-    })
-    .catch((error) => {
-      logger.warn(
-        'LLM relay bootstrap skipped:',
-        error instanceof Error ? error.message : error,
-      );
-    });
+      });
   void relayBootstrapTask;
 
   const providerSyncTask = llmProviderService

server/portal-agent-services-bootstrap.test.mjs

@@ -410,3 +410,17 @@ test('keeps disabled experience null and reports background LLM failures', async
     ),
   );
 });
+
+test('can disable relay bootstrap for backend-LLM-only isolated runs', async () => {
+  const setup = createSetup({
+    env: {
+      EXPERIENCE_PG_URL: 'postgres://experience',
+      H5_RELAY_BOOTSTRAP_DISABLED: '1',
+    },
+  });
+  const result = await bootstrapPortalAgentServices(setup.options);
+  await Promise.all([result.relayBootstrapTask, result.providerSyncTask]);
+  assert.equal(result.relayBootstrapTask instanceof Promise, true);
+  assert.equal(setup.calls.some(([name]) => name === 'relay-bootstrap'), false);
+  assert.equal(setup.calls.some(([name]) => name === 'provider-sync'), true);
+});