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Preserve subprocess_create failure error details (#96)

* Preserve create failure error details

🧙 Conjured by AI via [pi.dev](https://pi.dev/) using gpt-5.5

* Return portable create error codes

🧙 Conjured by AI via [pi.dev](https://pi.dev/) using gpt-5.5
N
Neil Henning committed
945f5ad3a6bfb37984816cb4b8d3746cc9aed695
Parent: a70a953
Committed by GitHub <noreply@github.com> on 5/24/2026, 12:59:56 PM