debug.ReadBuildInfo() can report a version whose major version does
not match the module path's major version suffix (e.g. a v2 tag on a
module without a /v2 path), which is unreliable per Go's module
versioning rules. Extract the decision into resolveVersion() and only
accept the build version when its major matches the module path's
implied major version, otherwise fall back to the dev version.
Fixes#231.
Co-Authored-By: Codet <codet@commitgo.dev> (GPT-5-Codex)
Lunny Xiao