Include failure context in splice events#4514

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jkczyz wants to merge 12 commits intolightningdevkit:mainfrom

jkczyz:2026-03-splice-rbf-fail-event

Commits on Apr 28, 2026

Add NegotiationFailureReason to SpliceFailed event

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f - mark NegotiationError and CounterpartyAborted as not retriable
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Add FundingContribution to SpliceFailed event

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Emit DiscardFunding before SpliceFailed

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Rename SplicePending and SpliceFailed events

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Simplify contribution pop in reset_pending_splice_state

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Fix output filtering in into_unique_contributions

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Derive SpliceFundingFailed inputs from FundingContribution

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Remove unused NegotiationError and contributed_inputs_and_outputs methods

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Add pending changelog for splice negotiation event changes

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Check can_initiate_rbf in stfu handler before sending tx_init_rbf

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Derive DiscardFunding inputs and outputs from contributions on promotion

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