v1.31.0 requested ORT_API_VERSION 26 (onnxruntime 1.26); the field DLL is Python 3.8's onnxruntime 1.19.2 (API 19), so GetApi(26) returned NULL and init failed. v1.12.1 targets ORT API 19, matching the existing DLL with no download. Verified: native cgo build of internal/spike compiles ort.go against v1.12.1; Gio UI still cross-compiles for Windows. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>