test: adversarial overlap fixtures for tool dispatch #267

Job	Run time
Performance benchmarks (gated)	38s
mypy	22s
pytest (windows-latest)	2m 2s
pytest (macos-latest)	35s
Verify prod requirements.txt is sufficient	8s
ruff + pip-audit (ubuntu-latest)	20s
API integration tests + coverage (macos-latest)	18s
Frontend unit tests (vitest) (macos-latest)	29s
Frontend unit tests (vitest) (ubuntu-latest)	25s
API integration tests + coverage (ubuntu-latest)	22s
API integration tests + coverage (windows-latest)	53s
ruff + pip-audit (windows-latest)	1m 17s
pytest (ubuntu-latest)	52s
ruff + pip-audit (macos-latest)	22s
Frontend unit tests (vitest) (windows-latest)	53s
	9m 56s

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