Vault Cleanup Auditor

This runs four targeted checks on your Obsidian vault and drops a dated markdown report in a vault-audit folder. It finds drafts older than 30 days that haven't been posted, files with no headings but enough content to matter, duplicate filenames across folders, and empty directories. The whole thing runs in under 30 seconds using bash and standard Unix tools. No APIs, no paid services, just file system traversal. It's the kind of thing you'd run monthly when your vault starts feeling cluttered and you need a concrete list of what to clean up rather than just a vague sense that things are messy. The self-critique phase at the end ensures all four checks actually ran and the counts match.