API & MCP: Ads Radar, Shopping, Content Agent & Reports

A big batch of additions across the REST v2 API, the MCP server, and Agent Chat:

• Ads Radar endpoints: query detected ads, advertisers, and the prompts they appear on.
• Shopping endpoints: tracked products plus product and merchant analytics.
• Content Agent endpoints: manage settings and review, accept, or publish content slots programmatically.
• Report tools: create and fetch PDF reports straight from Agent Chat or MCP.