fix: use supported redirect mode for Workers organization requests

tests/worker-runtime.test.js

@@ -0,0 +1,16 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { createRequire } from 'node:module';
+import { fileURLToPath } from 'node:url';
+import { spawnSync } from 'node:child_process';
+
+const require = createRequire(import.meta.url);
+const workerd = require('workerd').default;
+
+test('native Workers runtime resolves session organization and rejects upstream redirects', () => {
+  const result = spawnSync(workerd, ['test', fileURLToPath(new URL('./runtime/organization.capnp', import.meta.url)), 'organization'], {
+    encoding: 'utf8', timeout: 20000
+  });
+  assert.equal(result.error, undefined, result.error?.message);
+  assert.equal(result.status, 0, result.stdout + result.stderr);
+});