Add controlled fixture ACK observability

cai

2026-08-12 9eca12eae4372c79eb35cef972f1ab4756c0a5e0

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