The CLI tool already exposes these flags for controlling the vocoder's
chunked-decode window. tts-server always used the hardcoded 24.0s
chunk / 2.0s left-context defaults, with no way to override them at
the server binary's CLI, unlike qwen-tts.
This matters on memory-constrained GPUs: utterances shorter than the
chunk duration decode in a single pass, which can OOM on a small GPU
shared with other processes. Tightening these values (e.g. 4.0/1.5)
forces genuine chunked decode with bounded peak memory per chunk.
