test: add Hypothesis fuzz coverage and macos-latest CI matrix #151

Job	Run time
pytest (macos-latest)	34s
pytest (windows-latest)	1m 19s
ruff + pip-audit (ubuntu-latest)	26s
ruff + pip-audit (macos-latest)	22s
Verify prod requirements.txt is sufficient	6s
API integration tests + coverage (macos-latest)	32s
Frontend unit tests (vitest) (ubuntu-latest)	16s
API integration tests + coverage (ubuntu-latest)	19s
Frontend unit tests (vitest) (windows-latest)	38s
pytest (ubuntu-latest)	46s
API integration tests + coverage (windows-latest)	1m 0s
ruff + pip-audit (windows-latest)	58s
Frontend unit tests (vitest) (macos-latest)	19s
mypy	24s
	7m 59s

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