Update AGENTS.md with Correct Health Check Endpoint

This ticket addresses a critical error in the agent's session initialization protocol as documented in AGENTS.md. The current instructions specify using http://localhost:8001/health to check the status of the memory core server. This endpoint is incorrect for the version of ChromaDB in use, resulting in a 404 Not Found error and causing the health check to fail silently.

This silent failure has led to repeated debugging cycles in multiple sessions. The correct, functional endpoint has been identified as http://localhost:8001/api/v2/healthcheck. Additionally, the Swagger UI available at http://localhost:8001/docs/ is a valuable resource for endpoint discovery and should be documented for future debugging.

This sub-task aims to:

• Correct the health check command in AGENTS.md to prevent future initialization failures.
• Add a note about using the /docs endpoint for easier debugging of the memory server API.

Acceptance Criteria

1. The curl command in AGENTS.md for the memory core health check is updated to use the correct /api/v2/healthcheck endpoint.
2. A note is added to AGENTS.md mentioning the availability of the Swagger UI at the /docs endpoint for debugging purposes.