Replace the minimal placeholder .env.example with a comprehensive template
documenting every variable consumed by docker-compose.yaml, organized by
service (Django core, HTTP, Postgres, Neo4j, Memcached, S3/MinIO, Daedalus,
Celery/RabbitMQ, etc.). Clarifies that this file is rendered from an Ansible
Jinja2 template with vaulted secrets in production, and distinguishes it
from the in-tree mnemosyne/.env used for bare-Python development.
Robert Helewka
003f958f7b