FLOW-1: Prevent double-refund on failed CREATE/DEPOSIT #35
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Fixes #16
FLOW-1 is addressed by using a single-path, pull-based refund model (crediting
claimableRefundsand requiring the user toclaimRefund) rather than mixing direct refunds with escrow credits.This PR adds regression coverage for the failed DEPOSIT_TO_YIELDVAULT path (CREATE already has coverage) to ensure failures always result in a claimable refund and never re-introduce double-refund semantics.