MGS1016: workspace-local Go replace directives drifted
A Go module requires a module declared by another project in this workspace, but
its go.mod does not replace that dependency at the relative project path.
Magus derives only replacements whose left-hand module path belongs to this workspace. Replacements for upstream forks, vendored patches, and other external modules are left untouched.
Resolution
Run the owning project's sync target with the write charm:
magus run mod-sync:rw <project>
The target runs go mod edit; magus never writes go.mod directly.