Include failure context in splice events#4514

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jkczyz wants to merge 9 commits intolightningdevkit:mainfrom

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

Commits on Apr 3, 2026

Add NegotiationFailureReason to SpliceFailed event

jkczyz
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claude
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Add FundingContribution to SpliceFailed event

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claude
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f - Remove dead funding_txo and channel_type from SpliceFundingFailed

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claude
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Emit DiscardFunding before SpliceFailed

jkczyz
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claude
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Rename SplicePending and SpliceFailed events

jkczyz
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claude
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Simplify contribution pop in reset_pending_splice_state

jkczyz
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claude
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Fix output filtering in into_unique_contributions

jkczyz
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claude
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Derive SpliceFundingFailed inputs from FundingContribution

jkczyz
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claude
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Remove unused contributed_inputs_and_outputs methods

jkczyz
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claude
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