Build and maintain project-specific Obsidian knowledge bases through Obsidian CLI. Use when an agent needs to (1) ask once for a vault and persist it for a workspace, (2) capture prompt/run context as structured Markdown notes, (3) auto-link notes with wikilinks for strong backlink coverage, (4) retrieve context quickly via Obsidian CLI search/read commands, or (5) audit graph hygiene with unresolved/orphan/dead-end link checks.