fix: Ralph wizard uses file-based prompt to avoid screen escaping issues

- Add /api/sessions/:id/ralph-prompt/write endpoint to write prompt to @ralph_prompt.md
- Wizard now writes full prompt to file, then sends simple read command to Claude
- Fix session readiness check to wait for prompt character instead of notWorking flag
- Add E2E test infrastructure for ralph-loop workflow (port 3190)
- Add ralph-wizard-prod.mjs script for production testing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

test/e2e/fixtures/index.ts

@@ -0,0 +1,35 @@
+/**
+ * E2E Test Fixtures
+ * Central export for all fixture utilities
+ */
+
+export {
+  createServerFixture,
+  destroyServerFixture,
+  type ServerFixture,
+} from './server.fixture.js';
+
+export {
+  createBrowserFixture,
+  destroyBrowserFixture,
+  navigateTo,
+  waitForVisible,
+  clickElement,
+  typeInto,
+  getText,
+  isVisible,
+  getElementCount,
+  type BrowserFixture,
+} from './browser.fixture.js';
+
+export {
+  CleanupTracker,
+} from './cleanup.fixture.js';
+
+export {
+  captureAndCompare,
+  captureScreenshot,
+  updateBaseline,
+  type ScreenshotOptions,
+  type ScreenshotResult,
+} from './screenshot.fixture.js';