Add Chapter 5: CLI Tools#4
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Maps Python's argparse/click to clap derive macros. Covers declarative argument parsing, subcommands as enums with exhaustive matching, structured output (text + JSON from the same Serialize type), NoteStore CRUD with filtering and search, and command dispatch. 14 passing example tests, 5 exercises building a task manager CLI (CLI definition, data model, store with filtering, structured output, and exhaustive dispatch). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Test plan
cargo test -p ch05-cli-tools— 14/14 passcargo clippy --workspace -- -D warnings— cleancargo fmt --all -- --check— cleanDepends on #3
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