fix(go): Don't allow auto mod=vendor mode

[mariduv]

Currently, using go-backend tools in a project directory that is also using go vendoring emits error messages and can't find versions during outdated and upgrade :

go: can't determine available versions using the vendor directory
        (Use -mod=mod or -mod=readonly to bypass.)
mise WARN  No versions found for delve

The underlying command here is go list -m -versions -json <module>; the go toolchain switches itself to -mod=vendor if a vendor directory is present. The go install run by mise, on the other hand, always has an @<version>, so vendored modules are never used for install. So I think only the "mod=vendor is unexpected/unwanted" case needs to be covered for a fix at this time.

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Note

Force go list to use -mod=readonly so versions can be listed even when a vendor directory exists.

• Go backend:
  • Use go list -mod=readonly -m -versions -json <module> in src/backend/go.rs::_list_remote_versions to avoid implicit -mod=vendor and ensure module versions are retrievable.

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[jdx]

bugbot run

[cursor]

✅ Bugbot reviewed your changes and found no bugs!

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