2026-09-07: the “6 of 7 diagrams fail to render” problem since 9/2 was file ownership, not mmdc — docs/workflows/svg/*.svg and /opt/workflow-guides/svg were root-owned after a one-off render as root, and render-workflows.sh sent mmdc stderr to /dev/null. Fixed: chown claude:claude, script now preflights writability (exits with a chown hint), logs to docs/workflows/.render.log, and copies each svg to /opt/workflow-guides/svg/ (the guides link /svg/.svg; that publish step was missing). entirely-api f780e91. Never render as root.