backport: Merge bitcoin#26053, 28230, 28500#7256

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vijaydasmp wants to merge 3 commits intodashpay:developfrom

vijaydasmp:Apr_2026_1

Commits on Apr 9, 2026

Merge bitcoin/bitcoin#26053: rpc: bugfix, 'add_inputs' default value is true unless 'inputs' are provided

achow101
authored and
vijaydasmp
committed
Merge bitcoin/bitcoin#28230: rpc: Add MaybeArg() and Arg() default helper

fanquake
authored and
vijaydasmp
committed
Merge bitcoin/bitcoin#28500: Prevent default/invalid CKey objects from allocating secure memory

fanquake
authored and
vijaydasmp
committed