Rename `Settings` structs to `Options` for consistency

OSS-Fuzz issue 553133836 - issue with env fuzzer

Use RISE riscv runners in CI

ptx: g flag should accept only positive non-zero values

printf: arithmetic overflow (overflow-checks) on a `%*d` dynamic field width of `i64::MIN`

pr panics ("Formatting argument out of range") on a large `-n` width or `-W`/`-w` page width

pr: arithmetic overflow (overflow-checks) on a huge `-N` line number or `-l` lines-per-page

split fails if xaa ls symlink to /dev/stdout

bug(install): not error out when a is not a dir in -d

bug(realpath): when a filename larger it do not error out