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Replace legacy Python CI helpers with tested Rust equivalents #129

Job	Run time
Coverage ledger is honest (--fail-on-incomplete)	1m 55s
Installation entrypoint controls	4s
MSRV (rust-version in Cargo.toml)	21s
cargo test (http,sarif)	59s
cargo clippy -D warnings	22s
cargo doc (no broken intra-doc links)	13s
cargo fmt --check	10s
cargo test (http)	1m 17s
cargo test ()	1m 19s
	6m 40s