glob: match explicitly-named dotfiles and resolve literal paths through symlinks - #32853

The `**/.dotdir/...` fix only works when readdir reports `DT_DIR`: the `SymLink` arm (with `followSymlinks:true`) and the `Unknown` arm both gate on `eval_impl(&active, entry_name)` before reaching `eval_dir`, and `eval_impl` never peeks past `**`, so for active={`**`} and entry `.dotdir` it returns `false` and the entry is skipped. Result: `new Glob("**/.dotdir/inner.txt").scan({followSymlinks:true})` finds the file when `.dotdir` is a real directory but returns `[]` when `.dotdir` is a symlink