test(dpp): add StepDecreasingAmount and validate_update keyword/description error path tests#3125

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thepastaclaw wants to merge 3 commits intodashpay:v3.1-devfrom

thepastaclaw:test/validation-error-paths-contract

Commits on Feb 21, 2026

test(dpp): add StepDecreasingAmount validation error path tests (C-13)
thepastaclaw
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test(dpp): add validate_update keyword/description error path tests (I-02)
thepastaclaw
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style: apply cargo fmt formatting
thepastaclaw
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