fix(helper): gate audio observer on fixture ack

cai

2026-08-11 949be8e5f1a75286b8b517dacda76ed27646e77b

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[source.crates-io]
replace-with = "rsproxy"
 
[source.rsproxy]
registry = "sparse+https://rsproxy.cn/index/"
 
[net]
retry = 5