A zap answers as fast as the route allows.

The wallet used to add two to four seconds of its own around a Lightning
send: a random pause plus a relay look-back before paying, and a
two-second poll for the result after. The notifier's claim now decides
who pays in one round trip, with the relay look-back kept only for
replays and for when the notifier gives no verdict; a phone answering
from behind another app waits a second so a desktop tab wins the claim
instead of paying at a throttled crawl. After the send, one held
CheckLightningPayment call brings the preimage the moment CLN has it —
for wallet-connect pays, the background worker, and the app's own Send.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01QYJfZ4A1TDCEY4Foq3CApR

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