Make all peer messages constant message size#8893

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rustyrussell wants to merge 11 commits intoElementsProject:masterfrom

rustyrussell:guilt/constant-message-size

Commits on Feb 13, 2026

pytest: add fixture for checking packet sizes.
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CI: run tests in the `wireshark` group so we can test packet sizes
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connectd: refactor outgoing loop.
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connectd: refactor to break up "encrypt_and_send".
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connect: switch to using io_write_partial instead of io_write.
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connectd: don't toggle nagle on and off, leave it always off.
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devtools/gossipwith: don't count "padding" pings towards max-messages count.
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connectd: pad messages with dummy pings if needed to make size uniform.
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connectd: don't flush messages unless we have something important.
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connectd: only do lazy transmission for *definitely* non-urgent messages.
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connectd: use membuf for more efficient output queue.
rustyrussell
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