Growth could never post. Its page is opened with newPage() and was never
navigated, so it sat on about:blank, whose opaque origin cannot fetch
Reddit at all — production logged "Failed to read the Reddit session
modhash: TypeError: Failed to fetch" on every attempt. Confirmed against
real network: the same fetch throws from about:blank and succeeds from
https://old.reddit.com.
The transport now parks the page on that origin before any request, and
re-parks it if the page wanders elsewhere. Being same-origin is also what
sends the session cookies, so the authenticated info.json lookup moved to
the same host rather than www; the signed-out visibility probe stays on
www because it runs from Node, where CORS does not apply.
The unit tests could not catch this: they stub the transport, and the
earlier browser check navigated the page by hand in the harness — the
production path was the one place that never did. The page fake now
starts on about:blank like the real thing and asserts the navigation.
Also stop a transport failure from invalidating the account session. A
modhash lookup that could not reach Reddit returned session-invalid,
which calls auth.invalidate() and so would disrupt outreach and chat for
that account over a network blip. Only Reddit actually reporting a
signed-out session (HTTP 401/403, or a response with no modhash) does
that now; anything else is retryable.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
