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test / run tests/run_tests.py (pull_request) Successful in 21s
_expand_tilde was a path-string helper on DockerBottleBackend but nothing about it was Docker-specific — any future backend reading host paths from manifest entries would want it. Lift to claude_bottle/util.py (sibling of log.py / manifest.py) as a public expand_tilde() function. Docker-specific primitives stay in claude_bottle/backend/docker/util.py.