Funding transaction withholding support#8546

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rustyrussell wants to merge 15 commits intoElementsProject:masterfrom

rustyrussell:guilt/withhold

Commits on Sep 12, 2025

lightningd: allow another gossip state transition.
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pytest: test case where we crash before bitcoind gets the opening tx.
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lightningd: save funding_psbt in channel, database.
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sendpsbt: update channel psbts if this is a channel PSBT.
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lightningd: re-xmit funding txs on startup.
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pytest: test failure if we crash after fundchannel_complete but before sendpsbt.
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lightningd: expose funding PSBT (if we have it) in JSON API.
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spender: look for unsigned PSBT on awaiting channels on startup, and re-send.
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lightningd: save funding PSBT to database if we're to withhold it.
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lightningd: add withheld flag to listpeerchannels and listclosedchannels.
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lightningd: immediately close without broadcast whenever we close a withheld channel.
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lightningd: don't rebroadcast withheld channels' funding_psbt on restart.
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lightningd: add withhold option to fundchannel_complete.
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lightningd: remove withheld flag when we see sendpsbt.
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pytest: test withhold parameter to fundchannel_complete.
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