Expand the generated-file gate beyond *_gen.go and go.sum to cover generated tests, msgp output, stringer files, go.mod, and untracked generated artifacts.
Regenerate the 19 stale stringer outputs with the go.mod-pinned x/tools version. Runtime String output is unchanged, and a repeated generation pass now leaves the tree byte-identical.
Co-authored-by: ChatGPT <noreply@openai.com>
Co-authored-by: Claude <noreply@anthropic.com>
Feng Ruohang