The helper is a new file, so its diff is entirely additions and can never
be "purely structural". It declares colours rather than rendering any, and
tests/functional.fish asserts its 12 roles directly.
Compares rendered stdout and stderr of 29 colour-bearing cases between a
pristine baseline ref and the working tree, in isolated XDG_CONFIG_HOMEs
that carry the gitignored fish_variables so the opinionated guards resolve.
Two traps this harness exists to avoid, both of which silently produce a
meaningless comparison rather than an error:
- `git archive main` omits fish_variables because it is untracked. Without
it __fish_config_op_enabled is unresolvable and every guarded function
short-circuits, so all cases render empty and trivially "match".
- `qc --help` shells out to aichat and never reaches its colour path
unless aichat is on PATH; the harness stubs it.
rootiest