Add Chapter 6: FFI & PyO3#5
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Teaches the core-layer/boundary-layer pattern for Rust-Python interop. All examples are pure Rust (no PyO3 build required) demonstrating how to structure code for Python-callable libraries: Python-friendly function signatures, builder patterns, error handling at the boundary, batch operations, content-addressed stores with JSON export. 14 passing example tests, 5 exercises (word count, Record with JSON roundtrip, email validation, batch processing with structured errors, KeyValueStore with content-addressed export). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Test plan
cargo test -p ch06-ffi-and-pyo3— 14/14 passcargo clippy --workspace -- -D warnings— cleancargo fmt --all -- --check— cleanDepends on #4
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