Add OpenAPI coverage test #74

Job	Run time
typecheck (mypy --strict)	17s
Hawk daemon contract snapshot	8s
duplication	10s
lint (ruff)	16s
security (pip-audit)	24s
test (Python 3.12)	1m 23s
test (Python 3.10)	1m 24s
test (Python 3.9)	1m 26s
test (Python 3.11)	1m 24s
test (Python 3.13)	1m 26s
build (sdist + wheel)	13s
	8m 31s

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