Cerveau Viewer — read-only brain browser powered by cerveau.dev. Reads ~/.cerveau/ directory structure: brains, protocol rules, package registry, and brain files. Enabled via --cerveau-dir / MDPLANNER_CERVEAU_DIR (defaults to ~/.cerveau).

Local Dev tab — renders local-dev.md with markdown preview.

Markdown preview toggle — .md files in the file browser can be toggled between raw source and rendered preview.

Marketplace browser — search/filter packages by name, type, or tags. Shows per-brain installation status badges.

Recursive file tree — pre-loads the full directory tree in one call for instant expand/collapse with symlink indicators.

Docker Compose — replaced MDPLANNER_BRAINS_CONFIG and MDPLANNER_CLAUDE_DIR env vars with MDPLANNER_CERVEAU_DIR.