v1.54.0 — VSIX v1.5.0 only (Current) ✅

• AI Pipeline Intelligence — 🧪 Generate Test + 🔍 Explain Failure buttons in Debug Panel node stepper; FlowAIModel serializer (structured trace → compact AI schema); claude -p CLI-first (uses Pro subscription) with direct Anthropic API fallback; smart PATH error messages (installed-but-not-in-PATH vs not-installed); NuGet packages unchanged at v1.54.0