Colab run 5 failed at cell 12 (import luke_scribe.config) because hatchling editable installs write a .pth pointing at src/ that the interpreter only reads at startup; a long-running Colab kernel started before pip install -e never sees it. Subprocesses (CLI) work, but kernel-side imports fail.
Fix: install cell now walks up to the repo root and inserts src/ into the kernel sys.path, verifying with import luke_scribe.config. Cell 12 has a defensive guard of the same kind. Tunnel external verification now retries up to 6x2s for DNS propagation. Troubleshooting section documents the issue.
lukehemmin
5b8576e2a3