Qwen3-TTS as modified on the audio node, kept. Quality over time is the principle that
settles it, and the engine already in use is the one worth keeping.
The modifications are on the audio node and unknown here, so the speak work function
cannot be written blind. Listed what is needed: what changed and why, whether it is a fork
or a carryable patch, the input contract, and whether it loads a model and how large -
which decides whether node 238 can run it at all.
Parallel synthesis is a requirement, not an optimisation. The mechanism exists already
(submit_children and the decompose route), which means the work-function protocol has to
be designed for decomposition rather than have parallelism retrofitted into it.
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