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Coverage instrumentation (--cov) in pyproject.toml addopts was adding 3-5x overhead on the 2-core ARM CI runner. Disable it in CI with --no-cov and --override-ini to clear addopts. Add --durations=20 to identify slowest tests. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>