os-self-test

Verify the AI Dev Operating System is in a coherent state inside a project. Detects missing canonical files, broken cross-references, skills/agents/commands without frontmatter, registry drift, unindexed session logs, unwired hooks and gitignore gaps. Run after major edits to the OS, after renaming or moving canonical files, before opening a new sprint, before a release, and when the user says "tá tudo certo aqui?",…