feat(builtins): implement pushd, popd, dirs#268
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Add directory stack builtins: pushd (push dir + cd), popd (pop + cd), dirs (display stack with -c, -p, -v flags). Stack stored in internal variables. 12 spec tests.
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Summary
pushdbuiltin: push current directory onto stack, cd to target; swap top two with no argspopdbuiltin: pop top directory from stack and cd to itdirsbuiltin: display stack with-c(clear),-p(per-line),-v(verbose/numbered)_DIRSTACK_*variablesTest plan
cargo clippy --all-targets --all-features -- -D warningspassescargo test --all-features --test spec_tests bash_spec_testspasses