spr migrated books, and tester

artery/shunts/example/README.md

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+# Example Shunt
+
+Template for creating fake service connectors for testing.
+
+## Usage
+
+```bash
+# Run the shunt
+python main.py
+
+# Or with uvicorn
+uvicorn main:app --port 8099 --reload
+```
+
+## Creating a New Shunt
+
+1. Copy this directory:
+   ```bash
+   cp -r shunts/example shunts/mercadopago
+   ```
+
+2. Edit `depot/responses.json` with fake responses
+
+3. Update `main.py` to match the real vein's API endpoints
+
+## Configuration
+
+Edit `depot/responses.json` to configure fake responses:
+
+```json
+{
+  "GET /endpoint": {"response": "data"},
+  "POST /endpoint": {"success": true}
+}
+```
+
+The shunt UI at `/` shows current configuration.