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The python lint job set VENV_DIR=F:\CI\python\venv (the shared orchestrator venv) and ran `pip install -e ".[dev]"`. Every lint run repointed ci_orchestrator at the lint job's transient checkout; once act_runner cleaned that dir, all later smoke/build jobs failed with "No module named ci_orchestrator". Use a job-local venv under github.workspace, rebuilt fresh each run. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>