Install git_hoox shims.
mix git_hoox.install # refuse if user hook exists
mix git_hoox.install --force # backup + overwrite shims (and config)
mix git_hoox.install --dry-run # plan only, write nothing
mix git_hoox.install --scaffold # also write a starter .git_hoox.exsDetects core.hooksPath and worktrees via git rev-parse --git-path hooks.
When .git_hoox.exs sets auto_deps_get: true, each shim first runs
mix deps.get if the lock is out of date, so a stale mix.lock no longer
fails the hook with "Unchecked dependencies". Re-run this task after
changing the flag to regenerate the shims.