Collapse all AI-related dot-directories stuff under AGENTS.md

### Clear and concise description of the problem I have a lot of symlinked agent-related dot directories in order to accommodate project-specific configuration for different users of my repository. Maybe other people do too? I think it can be more organized. ### Suggested solution I think it should all go under AGENTS.md. Right now only `CLAUDE.md` is nested. ``` AGENTS.md # canonical index / entry point ├─ CLAUDE.md # Claude-specific instructions ├─ .claude/ # Claude config (may be symlinked) ├─ .cursor/ # Cursor config (may be symlinked) ├─ .codex/ # Codex / OpenAI agent config ├─ .aider/ # Aider config (optional) └─ .continue/ # Continue.dev config (optional) ``` ### Alternative _No response_ ### Additional context _No response_ ### Validations - [x] Follow our [Code of Conduct](https://github.com/antfu/.github/blob/main/CODE_OF_CONDUCT.md) - [x] Read the [Contributing Guide](https://github.com/antfu/contribute). - [x] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.