Cancelled runs are now eligible for retry alongside other failed and
dead runs. A user who cancels a run and then changes their mind no
longer has to manually re-create it from scratch.
- ensure_retryable drops the FailureReason::Cancelled rejection arm
- canRetry simplifies to failed || dead (still gated by !archived)
- OpenAPI Retry Run description no longer lists cancelled as ineligible
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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