The wait-action's healthcheck was still 401ing despite the bypass query
being correct. Root cause: with `x-vercel-set-bypass-cookie=true`, Vercel
returns 307 + Set-Cookie (`_vercel_jwt`), but axios in Node has no cookie
jar — it follows the redirect to the bare URL without the cookie, which
then 401s.
Local verification (run by operator):
curl -sI "https://<preview>/?x-vercel-protection-bypass=<secret>" | head -1
→ HTTP/2 200 (works, no cookie needed)
curl -sI "https://<preview>/?x-vercel-protection-bypass=<secret>&x-vercel-set-bypass-cookie=true" | head -1
→ HTTP/2 307 (the redirect-without-cookie path that breaks axios)
For a one-shot healthcheck, the per-request bypass query is enough.
The cookie variant stays reserved for the future Playwright config
(adopt-playwright-smoke) where a real browser cookie jar exists.
Added an inline comment in preview-smoke.yml explaining this so the
next agent doesn't accidentally re-add the cookie param.
Co-authored-by: Cursor <cursoragent@cursor.com>
043a6ee78a