Use this skill whenever the user wants to work with Obsidian in any capacity. This is the ONLY skill for Obsidian vaults, .base files, Obsidian Markdown, Obsidian plugins, and Obsidian Web Clipper. Trigger for: creating or editing notes with wikilinks, callouts, embeds, or frontmatter; building or debugging .base files (formulas, filters, views, YAML quoting); Obsidian plugin development or hot-reload; Web Clipper JSON templates or AI Interpreter prompts; vault structure, daily notes, or the obsidian CLI. Also trigger when the user describes Obsidian-specific problems without naming Obsidian — like .base YAML errors, foldable callout syntax, base formula for tasks due this week, or clipper template for arxiv. Do NOT trigger for Logseq, Notion, Dataview plugin queries, generic markdown processing scripts, or general-purpose Chrome extensions.