feat(forms): add local Form A presentation preview

www/tools/phase9-nonproduction.test.mjs

@@ -6,6 +6,7 @@ import {
   resolveCounterConfig,
 } from '../src/utils/counter-mode.ts';
 import {
+  formAPreviewEnabled,
   formModeForRuntime,
   formRouteMapping,
   logicalFormForRoute,
@@ -36,6 +37,14 @@ test('form configuration defaults off and live remains fail-closed', () => {
   assert.equal(resolveMockFormResult('anything-else'), 'success');
 });
 
+test('Form A meeting preview requires explicit mock mode and remains staging-only', () => {
+  assert.equal(formAPreviewEnabled(undefined, 'false', 'mock'), false);
+  assert.equal(formAPreviewEnabled('true', undefined, 'off'), false);
+  assert.equal(formAPreviewEnabled('true', 'true', 'mock'), false);
+  assert.equal(formAPreviewEnabled('true', 'false', 'mock'), true);
+  assert.equal(formAPreviewEnabled('TRUE', 'FALSE', 'mock'), true);
+});
+
 test('form mapping covers nine native instances and five landing journeys', () => {
   assert.equal(formRouteMapping.filter((entry) => entry.kind === 'native-instance').length, 9);
   assert.equal(formRouteMapping.filter((entry) => entry.kind === 'landing-journey').length, 5);