Actions: staged and committed lightrag/kg/postgres_impl.py; pushed branch feat/multi-tenannt to origin

Decisions: Only committed the tracked postgres_impl.py change (other untracked dev scripts/docs/logs left uncommitted)

Next steps: If desired, add and commit the new dev helper files (Makefile, dev-start/stop/status, docker-compose.dev-db.yml) in a follow-up PR

Lessons/insights: The postgres_impl.py change ensures AGE extension is loaded into session and graph creation is robust; remote branch created and pushed successfully
