- Help text for `nvm install`/`use`/`exec`/`run`/`which` now ends with
"Uses .nvmrc if version is omitted; otherwise errors."
so it's clear that omitting the version is not a free fallback.
- Help signatures for `use`/`exec`/`run` now show `[current | <version>]`
to mirror `nvm which` and document that `current` is accepted.
- `nvm current` description now spells out that it resolves via `$PATH`
and is not affected by `.nvmrc`.
- README: add `current` to the list of special aliases, with the same caveat.
The `.nvmrc` section now states that `nvm use`/`install`/`which`
exit with status 127 when neither a version nor an `.nvmrc` resolves,
notes the (current) `exec`/`run` fallback as undefined behavior,
and points readers at `current` for the explicit "active node" use case.
Refs #3755
a6ec739430