conv-hardened: add frame-by-frame streaming graphs (fp32 + signed int8, 17 FIFO states); document both NPU deploy paths (windowed 1.15 ms/frame PESQ 2.998; streaming 16 ms hop PESQ 2.982)

upload LiSenNet conv_hardened_deep variant -> conv-hardened-deep/

upload LiSenNet conv_hardened variant -> conv-hardened/

consolidate: move flat files into gru/ + conv/ subfolders

consolidate: move flat files into gru/ + conv/ subfolders

consolidate: move flat files into gru/ + conv/ subfolders

consolidate: move flat files into gru/ + conv/ subfolders

upload LiSenNet conv variant -> conv/

upload LiSenNet rnn variant -> gru/

upload LiSenNet checkpoint + ONNX (fp32, int8 dyn/static)

upload LiSenNet checkpoint + ONNX (fp32, int8 dyn/static)

remove non-deployable dynamic weight-only int8 ONNX

upload LiSenNet checkpoint + ONNX (fp32, int8 dyn/static)

initial commit