intelligence(deepdive): Docker deployment scaffold for #830

- Add Dockerfile for production containerized pipeline
- Add docker-compose.yml for full stack deployment
- Add .dockerignore for clean builds
- Add deploy.sh: one-command build, test, and systemd timer install

This provides a sovereign, reproducible deployment path for the
Deep Dive daily briefing pipeline.

intelligence/deepdive/.dockerignore

@@ -0,0 +1,30 @@
+# Deep Dive Docker Ignore
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.Python
+*.so
+*.egg
+*.egg-info/
+dist/
+build/
+.cache/
+.pytest_cache/
+.mypy_cache/
+.coverage
+htmlcov/
+.env
+.venv/
+venv/
+*.log
+.cache/deepdive/
+output/
+audio/
+*.mp3
+*.wav
+*.ogg
+.git/
+.gitignore
+.github/
+.gitea/