WATCHER: get a signed callback when a new US product recall...

WATCHER: get a signed callback when a new US product recall is published (CPSC). Arm once, pay once. Optionally pass keyword to only fire on recalls whose title contains it (e.g. a brand or product). Fires once per new recall (deduped by recall id); bounded by maxFires/expiry. Existing recalls at arm time are baselined. Free public-domain data. Signed (verify offline) + retried; recoverable via watchers.status. Returns a watcherId.