The coverage gate failed twice in a row on GitHub Actions on the exact
same line (wake_alarm/_alarm_display.py:71), with the run rerun on the
identical commit -- ruling out a one-off flake. Could not reproduce
locally across 6 attempts, including running the exact same -n 4
invocation directly. The likely cause is a pytest-xdist/pytest-cov
worker coverage-combine timing issue specific to the CI runner that
isn't practical to root-cause further from here. Running the hook
serially removes the risk outright; local timing shows no meaningful
slowdown.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A7vbgtFfZmfxJtN5DdtJky
