Three changes to eliminate the stepper flash:
1. home-stepper.sx: server path reads cookie via (get-cookie) for
step-idx initial value. Client path reads document.cookie via
def-store. Both default to 0 when no cookie exists.
2. sx_server.ml: bypass response cache when sx-home-stepper cookie
is present. Render on main thread (not worker) so get-cookie
sees the parsed request cookies.
3. site-full.spec.js: flash detection test sets cookie=7 via
Playwright context, checks SSR HTML matches hydrated state.
Test: "No flash: SSR=7 hydrated=7 (cookie=7)" — passes.
Tested on fresh stack=site server subprocess.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
giles
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