discovery: replace chan error w/ actor.Promise[error] for gossip results#10589

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Roasbeef wants to merge 12 commits intolightningnetwork:masterfrom

Roasbeef:discovery-errchan-futs

Commits on Feb 18, 2026

actor: add CompleteWith and AwaitFuture generic package-level helpers
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lnutils: add ContextFromQuit to bridge quit channels to contexts
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discovery: add gossip result helpers wrapping actor.Future[error]
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discovery: replace chan error with actor.Promise[error] for gossip results
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funding: update SendAnnouncement to return actor.Future[error]
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peer+server: update gossip callers to use actor.Future[error] API
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discovery/test: update gossiper tests for actor.Future[error] API
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multi/test: add unit tests for gossip result helpers and context bridge
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discovery: complete promise on peer quit and ctx cancel
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discovery: use promise directly in ProcessRemoteAnnouncement quit case
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funding: handle ErrGossiperShuttingDown at all AwaitGossipResult sites
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actor/test: extend TestAwaitFuture to cover fn.Err result path
Roasbeef
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