`validate` accepts a reject option case-insensitively
(`o.lower() in {"reject", "abort"}`), so a gate authored as
`options: [Approve, Reject]` passes validation. But `execute`
compared the echoed choice case-sensitively, so picking `Reject`
fell through to the approval path and silently ran downstream
steps instead of aborting.
Lower-case `choice` before the reject comparison so the runtime
agrees with the validation that let the option through.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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