Detect documents designed for AI agents

There are AGENTS.md, CLAUDE.md and more, as well as "no agents" https://codeberg.org/rossabaker/no-agents.md and hidden instructions like reported at https://nesbitt.io/2026/05/28/protestware-for-coding-agents.html

Eventually SKILLs could be package'ish-like when distributed on marketplaces.

We likely should start tracking these, as some may have a direct impact on actual development workflows that use LLMs and that interpret these as instructions.