[Beta] Integrate AI agents with scoped permissions and proposals API

You can now connect permissioned AI agents to your store to assist with automated workflows through MCP endpoints. Agents can read store data and either apply changes directly (subject to write scopes, guardrails, and daily limits) or submit them as proposals requiring human review. Use the new agent proposals API to list, approve, or reject pending writes for products, variants, collections, inventory stock, and order tags. Autonomous agents are also supported via dedicated OAuth client credentials that issue short-lived tokens scoped strictly to the agent’s permissions.