text/ gh-style display-width string helpers (Truncate / FuzzyAgo / Pluralize)
compat/ server-CLI version skew probe (kubectl) + 24h TTL cache (gh internal/update)
acceptance/contract/ helpers_test.go for in-process cobra exec + golden assert
(uses iostreams.SetForTest singleton replacement; no t.Parallel)
cmdutil/errors.go: AllCodes() + ClassifyHTTPErrorOutputs() bridge for the
contract test suite (no behavior change in error handling)
go-runewidth promoted from indirect to direct (used by text.Truncate for
display-width-aware CJK truncation).
acceptance/contract/helpers_test.go forward-references cmd.NewRootCmd which
is exported in PR-7 — that file does not compile until then by design.
