HarnessAgent now supports image inputs for all harness adapters

The AI SDK's HarnessAgent layer now accepts image inputs across all of its harness adapters, including Claude Code, Cline, Codex, Cursor, Deep Agents, fx, GitHub Copilot, Grok Build, OpenCode and Pi. Images are passed alongside text in the standard AI SDK message format using a content array that mixes { type: 'text' } and { type: 'file' } parts, and are processed by each harness's underlying vision models. Documentation for the feature is available in the HarnessAgent image inputs section of the AI SDK docs.