vercel__workflow/.changeset/pre/python-workbench-app.md

Gate the e2e suite for cross-language conformance — tests whose subject is the JS implementation are marked JS-only, and an app declares via e2e-conformance.json which 99_e2e fixtures it implements plus any individual tests its runtime cannot yet support — and add workbench/python as the first non-JavaScript target. No-op for the existing workbench apps, which ship no declaration.