staticaddr/loopin: persist confirmed HTLC outputs - #1217
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Record the exact confirmed HTLC transaction, output index, and value so recovery sweeps the server-published output instead of reconstructing it from legacy assumptions.
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Description
The server can publish any of the standard, high-fee, or extreme-fee HTLC transaction variants signed by the client. Timeout recovery previously reconstructed only the standard variant, which could target a nonexistent outpoint after a backup variant confirmed.
Persist the exact confirmed HTLC transaction hash, output index, and value before timeout recovery. Clear the recorded outpoint on reorg, validate that the confirmed transaction spends the selected deposits in signed order, and retain the legacy reconstruction fallback for older swaps.
This PR is stacked on #1215.
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