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At 76%, molecule containers fail with "container is not running" because overlay2 runs out of space under parallel DinD load. The gentle prune (until=1h) at 75% was insufficient — runners stayed at 76% because nothing was older than 1h on busy runners. Lower the critical threshold to 75% so the full prune (no until filter) triggers immediately when disk reaches the level where tests fail. Also lower the gentle prune threshold to 70% to start cleanup earlier. This matches the infra CI disk gate which skips tests at 75%+. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>