09b961fcc4
Add modelImageReferences to preprocess agent contents, uploading local image references and surfacing their names in the prompt so the model can cite them. Wire the preparer into the canvas agent submission path, pass imageName through the floating composer references, and relax the prompt directive parser to accept names containing arbitrary characters. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>