Seven ways Core ML's state APIs crash a stateful VLM

Environment for everything below: macOS 26.5 (Darwin 25.5.0), Apple Silicon (arm64), coremltools 9.0, Python 3.13. Every crash described here reproduces deterministically with the scripts in the repo. A later OS may fix some of these — or quietly change the numerics; I measured both happening. So read this as a dated field report, not eternal truth. I converted SmolVLM-256M — a small multimodal vision-language model — to Core ML and wrote a zero-dependency Swift CLI that captions an image in…