backport: Merge bitcoin#29434, 29459#7406

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vijaydasmp:July_2026_6

Commits on Jul 4, 2026

Merge bitcoin/bitcoin#29434: rpc: Fixed signed integer overflow for large feerates

achow101
authored and
vijaydasmp
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Merge bitcoin/bitcoin#29459: test: check_mempool_result negative feerate

glozow
authored and
vijaydasmp
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Commits on Jul 5, 2026

Merge bitcoin/bitcoin#26684: bench: add readblock benchmark

achow101
authored and
vijaydasmp
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