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Replace legacy Python CI helpers with tested Rust equivalents #862

Job	Run time
rust-ci / Detect Cargo.toml	4s
rust-ci / Cargo check + clippy + fmt	24s
rust-ci / Cargo audit (security)	0s
rust-ci / llvm-cov line coverage	0s
rust-ci / Cargo test	1m 12s
	1m 40s