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trainer: skip completed phases / resume mid-phase + update context

Force line-buffered stdout for real-time log output in docker

Fix gradient checkpointing: enable_input_require_grads for PEFT without torch.compile

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

Fix: register LLM as nn.Module submodule so optimizer finds LoRA params

Day 3 COMPLETE: Full model architecture

feat: initial project scaffold for MINDI 1.5 Vision-Coder