docs: PR merge comment, coverage, mutation baseline; gitignore eval/m… #319

Job	Run time
Coverage (llvm-cov)	2m 36s
lint	1m 7s
cargo-deny (advisories + licenses)	4m 6s
mutation	1m 37s
version	3s
test (macos-latest)	41s
test (windows-latest)	43s
security	21s
test (ubuntu-latest)	38s
	11m 52s

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