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Fix OOM: disable torch.compile, reduce batch sizes, double grad_accumulation

Fix hidden_size: 4096 -> 3584 to match Qwen2.5-Coder-7B-Instruct

Add WebSight vision data pipeline: download script, image-aware data loader, phase data routing

Day 3 COMPLETE: Full model architecture

Day 1 Complete: Tokenizer setup — Qwen2.5-Coder-7B base + 22 MINDI special tokens (vocab 151,685), wrapper class, full format test

feat: initial project scaffold for MINDI 1.5 Vision-Coder