Shenava v4 — FastConformer-115M CTC — fp16 ONNX (in-browser / on-device)

• Input: processed_signal float32 [1, 80, 2005] — 80-dim log-mel features over a fixed 20.05 s window (NeMo FastConformer preprocessor; configs 115m_preprocessor.json + 115m_mel_filters.json included).
• Outputs: logits [1, 251, 1025] (CTC, blank id 1024) and encoded_lengths. Greedy-CTC decode with 115m_tokens.json; truncate logits to ceil(real_mel_frames / 8) before collapse.
• Golden6669 WER: 7.92% (CTC, official Persian normalizer). The parent's RNNT head scores 7.29%.
• Streaming: the deployed app streams by full-context re-decode of a growing buffer — zero accuracy penalty.