Request project-required Go versions above the supported range

[Copilot]

The Go build-environment resolver could retain an older toolchain when go.mod required a version above maxGoVersion, guaranteeing failure under GOTOOLCHAIN=local.

• Resolution

  • Request the go.mod version when Go is absent or older than the project requirement.
  • Request nothing when the installed version already satisfies the requirement.
  • Keep maxGoVersion as the extractor’s declared and tested support boundary.

• Diagnostics and coverage

  • Clarify that an above-boundary project version is being requested without implying extractor support.
  • Cover missing, older, equal, and newer installed toolchains.
  • Update the affected integration expectation.

For example, with Go 1.27 installed and go.mod requiring 1.28, resolution now returns:

{ "go": { "version": "1.28" } }

This may provision a Go version newer than the extractor’s tested support boundary, trading that compatibility risk for satisfying the project’s hard minimum and avoiding guaranteed build failure.