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feat(report): add --output-format kyaml #26

Job	Run time
cargo fmt --check	16s
cargo doc (no broken intra-doc links)	24s
cargo test (http,sarif)	45s
Coverage ledger is honest (--fail-on-incomplete)	2m 9s
MSRV (rust-version in Cargo.toml)	22s
cargo clippy -D warnings	31s
cargo test ()	53s
	5m 20s