Fix CI lint gate and restore >95% test coverage#21

Merged

dr-gareth-roberts merged 6 commits intomainfrom

fix/ci-coverage-95

Feb 6, 2026

Commits on Feb 6, 2026

Fix CI lint failures in coverage tests

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Apply Ruff formatting for CI lint compliance

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Install pytest in lint workflow job

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Set PYTHONPATH for stability contract check

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Install PyYAML runtime for lint stability test

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Install FastAPI deps in test matrix to avoid coverage skips

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