TestScan_StoresOnlyCoverTiers built the fixture path by hand, so in a tree where make testdata had not run it failed on a missing covers directory, where every other fixture test skips via testfixtures.Load. In a fresh worktree that failure blocked the pre-push hook for every branch. Closes #266 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017HJiuc3ZZhxsPXz3ozTirT