Extract structured JSON with an LLM

Accepts a URL, HTML, or text content plus a prompt and JSON Schema. The configured LLM provider must return JSON that passes the schema validator. When the first valid JSON object fails that schema, the service may make one corrective provider call inside the same request deadline; a second mismatch remains AI_SCHEMA_VALIDATION_FAILED. Requires Pro or higher. Intelligence work has one 18-second synchronous deadline across the complete request.