Address e2e review feedback

- Add ENABLE_CAPTCHA=false to CI app.ini so the server starts with
  CAPTCHA disabled instead of relying on env var in test script
- Retry on 502/503 in addition to 500 in apiRetry helper
- Fix typo: workarkound → workaround
- Add comment about section-unaware INI parsing in test-e2e.sh

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/test-e2e.sh

@@ -10,6 +10,7 @@ if [ -z "${E2E_URL:-}" ]; then
     echo "  E2E_URL=http://localhost:3000 make test-e2e" >&2
     exit 1
   fi
+  # Note: this does not respect INI sections, assumes ROOT_URL only appears under [server]
   ROOT_URL=$(sed -n 's/^ROOT_URL\s*=\s*//p' "$INI_FILE" | tr -d '[:space:]')
   if [ -z "$ROOT_URL" ]; then
     echo "error: ROOT_URL not found in $INI_FILE" >&2