Add Chapter 4: Content-Addressable Data#3
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Builds the concept of content-addressable data from first principles: BLAKE3 hashing, deterministic serialization with serde, a ContentAddressable trait with default methods, a content-addressed store with deduplication, verified retrieval, and composable Merkle-style content addressing. 17 passing example tests, 5 exercises building a mini CAS system from scratch (hash function, trait definition, Config implementation, content-addressed cache, and Merkle-chain snapshots). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
ContentAddressabletrait, content-addressed store, verified retrieval, composable Merkle-style addressinghashlib,json.dumps(sort_keys=True), and@dataclass(frozen=True)to Rust equivalentsTest plan
cargo test -p ch04-content-addressable— 17/17 passcargo clippy --workspace -- -D warnings— cleancargo fmt --all -- --check— cleanDepends on #2
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