test: add Hypothesis fuzz coverage and macos-latest CI matrix #152

Job	Run time
mypy	22s
ruff + pip-audit (ubuntu-latest)	22s
Verify prod requirements.txt is sufficient	7s
pytest (windows-latest)	1m 8s
API integration tests + coverage (macos-latest)	25s
pytest (macos-latest)	40s
Frontend unit tests (vitest) (macos-latest)	26s
pytest (ubuntu-latest)	38s
ruff + pip-audit (windows-latest)	1m 5s
Frontend unit tests (vitest) (ubuntu-latest)	19s
API integration tests + coverage (ubuntu-latest)	21s
Frontend unit tests (vitest) (windows-latest)	1m 4s
ruff + pip-audit (macos-latest)	50s
API integration tests + coverage (windows-latest)	53s
	8m 40s

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