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CLEANUP: Remove Experimental Files & Update Documentation

CRITICAL FIX: Removed conflicting download_models.py that was using old snapshot_download approach and HF Hub instead of our custom repo. This was causing ControlNet downloads to fail while SDXL worked. Now all models will use the unified download system in app.py

Force Space rebuild: Commit all pending changes to trigger deployment

🚨🚨🚨 NUCLEAR FORCE REBUILD: Add timestamp and obvious changes to force Space to detect and rebuild

CRITICAL: Copy working local SDXL ControlNet approach - use StableDiffusionXLControlNetPipeline instead of img2img

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