- Forward WITH_REASONING from the host environment to the document-parser
build args so `WITH_REASONING=true docker compose up --build` produces
the reasoning-enabled local image without editing the compose file.
- Mount a named hf_cache volume at /home/appuser/.cache/huggingface so
Docling / HF model checkpoints survive container restarts and the first
conversion does not re-download every cold start.
Add Neo4j as an optional graph-native storage layer (ingestion profile).
Introduces infra/neo4j with a singleton async driver wrapper and an
idempotent bootstrap of constraints + indexes, wired into the FastAPI
lifespan. Integration tests skip when no live Neo4j is reachable.
Refs #186
Default value of 5 is now in the application code (settings.py) instead
of only in the Docker image ENV. Consistent across all deployment modes
(dev local, Docker, tests). Aligned docker-compose files and docs.
