refactor: move platform config directories to repo root for discovery

Move .codex/, .opencode/, .openclaw/ from understand-anything-plugin/ to
repo root so each AI coding platform discovers its config at the standard
location. Delete .cursor/ (replaced by .cursor-plugin/plugin.json in next
commit). Plugin source code stays inside understand-anything-plugin/.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

understand-anything-plugin/.cursor/INSTALL.md

@@ -1,37 +0,0 @@
-# Installing Understand-Anything for Cursor
-
-## Prerequisites
-
-- Git
-
-## Installation
-
-1. **Clone the repository:**
-   ```bash
-   git clone https://github.com/Lum1104/Understand-Anything.git ~/.cursor/understand-anything
-   ```
-
-2. **Create the plugin symlink:**
-   ```bash
-   mkdir -p ~/.cursor/plugins
-   ln -s ~/.cursor/understand-anything/understand-anything-plugin ~/.cursor/plugins/understand-anything
-   ```
-
-3. **Restart Cursor** to discover the plugin.
-
-## Usage
-
-Skills activate automatically when relevant. Use `/understand` to analyze a codebase.
-
-## Updating
-
-```bash
-cd ~/.cursor/understand-anything && git pull
-```
-
-## Uninstalling
-
-```bash
-rm ~/.cursor/plugins/understand-anything
-rm -rf ~/.cursor/understand-anything
-```