fix(ios): fallback to ggml Metal GPU when ANE is unavailable#7
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Try loading V46 model with CoreML first. If CoreML is unavailable or loading fails, automatically retry without CoreML to use ggml Metal GPU. No private APIs, no device blacklists — pure try-then-fallback logic. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
Background
On some devices (e.g. iPhone 17 with iOS 26.x), CoreML fails to load or silently falls back to CPU, causing ViT inference to take ~47s. The ggml Metal GPU path handles the same inference in ~3s.
Test Plan