Deployment Env Isolation Check

1. Read .deploy.env.common and all .deploy.env.<env> files.
2. Merge common defaults with per-env overrides.
3. Compare environment identities (registry + user + host + port).
4. Fail when non-prod and prod identities are identical.

Command

python3 skills/deployment-env-isolation-check/scripts/check_isolation.py --root .