Function wrangler_age_notice 

pub fn wrangler_age_notice(probe: &Probe) -> Option<String>

#1732: the warning bynk dev prints before serving with a wrangler older than bynk_emit::WRANGLER_MIN. Its workerd refuses the pinned compatibility date outright, and wrangler’s own error says nothing about Bynk, so this names the cause and the fix first. A warning, not a refusal: the version is doctor’s judgement, and the wrangler itself has the last word. None when the wrangler is new enough, or can’t be versioned (npx).