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>

vitest.config.ts

@@ -4,7 +4,7 @@ export default defineConfig({
   test: {
     globals: true,
     environment: 'node',
-    include: ['test/**/*.test.ts'],
+    include: ['test/**/*.test.ts', 'test/e2e/**/*.e2e.ts'],
     setupFiles: ['./test/setup.ts'],
     // Run test files sequentially to respect screen session limits
     // Individual tests within files still run in parallel where safe