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The four CCCI state files (deploys countfile, opstate, deps, depskip) were keyed by app domain in shared /tmp. A second run of the same domain executes its main() preamble + deploy_app's pre-lock _record_deploy BEFORE blocking at the app lock, so it reset/polluted the live first run's counter (false DG4.1 deploy-count=2, build 279) and the first run's end-of-run os.remove crashed the second (FileNotFoundError, build 281). Masked pre-restructure by the end-to-end recipe flock. Now keyed by run id + harness pid via _run_state_path(); children receive exact paths via the CCCI_*_FILE env vars, so domain keying was never load-bearing. tests/concurrency/test_run_state.py: path-invariant cases + a real-process regression (helpers.py deploy-count-run) reproducing the live interleaving — verified to FAIL under simulated shared keying. docs/concurrency.md §3 updated.