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Phase 3.5: method-grid UI + overlays for each method

Pin sdk_version=5.49.1 (Gradio 5.0 predates huggingface_hub 1.x support)

Pin python_version=3.11 (Python 3.13 dropped audioop, breaks pydub/gradio)

Initial deploy: Gradio demo with 5-method pipeline + gallery

initial commit