Polls site login state for the panel's 人工登录 flow: opens the login page
(PUT /json/new with Page.navigate fallback — this Chromium build ignores
the ?url= param), probes via existing recipe or heuristics (visible
sign-in elements absent + account-testid element present), and on first
successful login can auto-generate a detection-only recipe (--write,
unique data-testid candidates only). JSON line output; exit 0 logged-in,
3 timeout.