feat(builtins): implement printf %q shell quoting#263
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Matches bash behavior: backslash-escapes printable special chars, uses $'...' quoting for control characters, leaves safe strings unquoted, and quotes empty strings as ''. https://claude.ai/code/session_012rzB3FRw7yoQWCG1mxyW7J
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Summary
printf %qformat specifier for shell-safe string quoting$'...'for control charsTest plan
cargo test --all-featurespassescargo clippy --all-targets --all-features -- -D warningscleancargo fmt --checkclean