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Fix recon's real baseline and simplify ledger verification #131

Job	Run time
cargo clippy -D warnings	19s
MSRV (rust-version in Cargo.toml)	26s
cargo doc (no broken intra-doc links)	19s
cargo fmt --check	5s
cargo test (http)	1m 20s
cargo test (http,sarif)	1m 5s
Installation entrypoint controls	5s
cargo test ()	1m 8s
Coverage ledger is honest (--fail-on-incomplete)	2m 20s
	7m 7s