Enhanced the demo test to cover more go/build functionality: - build.Import (existing) - build.ImportDir (new) - build.IsLocalImport (new) - build.Default context verification (existing, improved) This ensures the go/build patches work correctly across different public functions, not just Import. Also ran go fmt to fix formatting issues reported by CI. 🤖 Generated with [codeagent](https://github.com/qbox/codeagent) Co-authored-by: luoliwoshang <luoliwoshang@users.noreply.github.com>