feat(builtins): implement tac and rev builtins#262
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tac: reverses line order (opposite of cat) rev: reverses characters on each line Both support stdin and file arguments. https://claude.ai/code/session_012rzB3FRw7yoQWCG1mxyW7J
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Summary
tacbuiltin: reverse line order (opposite of cat)revbuiltin: reverse characters on each lineTest plan
cargo test --all-featurespassescargo clippy --all-targets --all-features -- -D warningscleancargo fmt --checkclean