Add support for Agent SDK structured outputs feature.
New input: json_schema - accepts JSON schema for validated outputs
Auto-sets GitHub Action outputs for each field in the structured result
Docs: https://docs.claude.com/en/docs/agent-sdk/structured-outputs🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
