refactor: fix session scope and duplicate import from simplify pass

fix: reduce ingestion concurrency to 1 to prevent OOM kills

fix: reset stuck 'processing' documents to 'not_started' on startup

chore: exclude large dirs from Docker build context

fix: document quality data in details endpoint, audit log init, test cleanup

fix: FalkorBackend.query returns consistent result_set for all query types

fix: update document repository tests to match 'not_started' status default

chore: update backend deployment SHA to faffd8e

fix: medical assistant conversation quality — slot loops, execution stall, disease inference

fix: message_count always shows 0 due to NULL column in Postgres

chore: update backend deployment SHA to b28516d

fix: use MCR mirror for python base image to avoid Docker Hub rate limits

fix: auto-title generation silently fails in LangGraph/Postgres mode

chore: add terraform/.gitignore lines to .gitignore

chore: clean up git tracking noise and commit accumulated changes