p2p tx broadcasting improvements and some other changes#2052

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ImplOfAnImpl wants to merge 10 commits intoupdate_rust_editionfrom

p2p_improve_tx_broadcasting

Commits on May 6, 2026

p2p: when a duplicate tx with local origin is added to the mempool, it will be broadcast to the peers again. Rename mempool event types.
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Fix exponential_rand and remove MAX_DELAY_FACTOR in p2p. Use a smaller tx relay delay for outbound connections. Replace "inbound: bool" with "direction: ConnectionDirection" in P2pEvent for consist…
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p2p: revamp tx sending (send multiple txs at once at random intervals instead of adding a random delay before each tx). Track which txs with local origin were broadcast but not sent, and rebroadcas…
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p2p: add a test for tx announcement order; introduce MonotonicTimeGetter.
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p2p: add test for unconfirmed tx reannouncement
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Appease clippy
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Fix duplicate tx rebroadcasting: use the "origin" of the duplicate instead of the existing one. Cleanup.
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P2p: sync mgr's next_time_to_requeue_unconfirmed_local_txs and next_time_to_announce_txs are now delayed at the start.
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Minor cleanup
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Update changelog
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