buildLiveTxForEscrow called .complete() with no presetWalletInputs, so lucid was
free to spend the dedicated 5-ADA collateral UTxO as an ordinary input. On
back-to-back requests this left the wallet with no collateral candidate and the
subsequent Accept failed with collateral_required, stranding the escrow.
Reserve the smallest pure-ADA UTxO >= 5 ADA and fund PostEscrow from the rest
(falls back to default selection for single/large-UTxO cases, which keep an
ample pure-ADA change UTxO anyway). Benefits the buyer too (same shared path).
Adds reserveCollateralInputs unit tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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