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make start-core (called by install.sh step 6) used $(DCF) which includes docker-compose.services.yml — that file declares cell-network as external:true. On a fresh machine the network doesn't exist yet, so compose up failed with "network cell-network declared as external, but could not be found". Fix: add the same network-create idempotency guard that start and update already have. Also add 26 regression tests (test_install_process.py) that verify install.sh structure and that all start-* targets using DCF create the network before running compose up. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>