Verified materializePodGraph against real demo-pod data (joins all connect:
21/21 interventions->collisions, learned_from produced). Tuning:
- engineer nodes are case-insensitive (merges Shakthi/shakthi)
- git (engineer_states) now only CONFIRMS editing on files vision/collisions
already surfaced, instead of adding the whole repo diff (killed a 29-file
node explosion from a watcher running against the full podman repo)
Cut demo-pod from 110 -> 77 nodes; git file-edges 39 -> 6.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
