feat: release 0.2.4 — +9 rules (serde_cbor, serde_yaml, tempdir, atty, etc.)

[Ruffian-L]

Summary

Rules database grows from 33 → 42 with 9 new hand-authored entries covering well-known deprecated/unmaintained crates:

Pattern	Replacement	Confidence	Status
serde_cbor	ciborium	High	README says "no longer maintained"
serde_yaml	serde_yml	High	Archived by dtolnay 2024
tempdir	tempfile	High	crates.io: "Moved to tempfile::TempDir"
atty	std::io::IsTerminal	High	Std replacement stable since Rust 1.70
futures-preview	futures	High	Pre-stabilization artifact
docopt	clap	Medium	No meaningful releases since 2021
slog	tracing	Medium	Older structured logging; tracing is go-to
ansi_term	owo-colors	Medium	Unmaintained for years
term	termcolor	Medium	Old; BurntSushi's termcolor is maintained

Test plan

• cargo test — 113 tests pass
• cargo check — clean
• JSON validates: python3 -c "import json; json.load(open('data/suggestions.json'))" — ok

🤖 Generated with Claude Code

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