ab5ff8ec56
pi-studio renders Mermaid natively but has no DOT renderer. Its markdown preview displays local PNG/JPG/GIF/WEBP images, so dot-watch closes the loop for Graphviz: edit .dot -> auto-render <name>.png -> Studio refresh-from-disk shows the update. Uses mtime polling (no inotify dep). - rootfs/usr/local/bin/dot-watch: the helper (executable) - Dockerfile.base: COPY + chmod, following the studio-expose pattern - README.md: 'Graphviz diagrams in Studio' subsection - CHANGELOG.md: Unreleased entry graphviz was already in the base image; no new package.